Current Electricity — practice questions
101 curated practice questions from Current Electricity (Physics JEE Advanced, NTA Exams) — 49 hard, 52 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- Statement–1 : Fuse wire must have high resistance and low melting point. Statement–2 : Fuse is used for small current…
- Statement–1 : It is advantageous to transmit electric power at high voltage. Statement–2 : High voltage implies high…
- The current i in the circuit (see figure) is
- In the circuit shown the resistances are given in ohms and the battery is assumed to be ideal with e.m.f. equal to 3.0…
- The potentiometer basically consists of a uniform wire of resistance R through which a steady current flows when a…
- Consider two identical galvanometers and two identical resistors with resistance R . If the internal resistance of the…
- Statement–1 : Potential measured by voltmeter across a wire is always less than the actual potential difference across…
- Three resistance of equal value are arranged in the different combinations as shown below. Arrange them in increasing…
- If a steady current I is flowing through a cylindrical element ABC . Choose the correct relationship
- A wire of length L and three identical cells of negligible internal resistances are connected in series. Due to the…
- Bohr and Biot purchased two electric kettles A and B of the same size and thickness and same volume of 0.4 litre. They…
- Statement–1 : A current flows in a conductor when there is electric field within the conductor. Statement–2 : The drift…
- A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of
- A strip of copper and another germanium are cooled from room temperature to 80 K. The resistance of
- Statement–1 : Potentiometer is better for e.m.f. measurement of a cell than a voltmeter. Statement–2 : A potentiometer…
- Find out the value of current through 2 W resistance for the given circuit.
- In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance…
- Express which of the following set ups can be used to verify Ohm’s law?
- A capacitor is charged using an external battery with a resistance x in series. The dashed line shows the variation of…
- The total current supplied to the circuit by the battery is
- Statement– 1 : In the circuit shown assume both cell are ideal and of fixed e.m.f., the resistor R 1 is fixed, the…
- Statement–1 : A 200 watt bulb glows with more brightness than 100 watt bulb. Statement–2 : 100 watt bulb has more…
- Two ideal batteries of emf V 1 and V 2 and three resistances R 1 , R 2 and R 3 are connected as shown in the figure…
- A 4 m F capacitor and a resistance of 2.5 M W are in series with 12 V battery. Find the time after which the potential…
- A Galvanometer is an instrument that can be used to construct an ammeter for measuring current .It can be used…
- In the shown arrangement of the experiment of the meter bridge if AC corresponding to null deflection of galvanometer…
- Shown in the figure adjacent is a meter-bridge set up with null deflection in the galvanometer. The value of the…
- A battery of internal resistance 4 Ω is connected to the network of resistances as shown in the figure. In order that…
- Bohr and Biot purchased two electric kettles A and B of the same size and thickness and same volume of 0.4 litre. They…
- Given below are two statements. Statement-1 : The resistivity of a semiconductor increases with increase of…
- Four Bulbs B 1 , B 2 , B 3 and B 4 of 100 W each are connected to 220 V main as shown in the figure. The reading in an…
- For the resistance network shown in the figure, choose the correct option(s).
- Statement–1 : When two conducting wires of different resistivity and having same cross sectional area are joined in…
- A potential difference is applied across a copper wire of radius 0.5 mm. It results in a uniform electric field of 1.5…
- A potential difference is applied across a copper wire of radius 0.5 mm. It results in a uniform electric field of 1.5…
- The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 ohm. This…
- In the circuit shown the resistances are given in ohms and the battery is assumed to be ideal with e.m.f. equal to 3.0…
- An infinite line charge of uniform electric charge density λ lies along the axis of an electrically conducting infinite…
- The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in…
- In a circuit shown in the figure, the capacitor C is initially uncharged and the key K is open. In this condition, a…
- In an aluminium (Al) bar of square cross section, a square hole is drilled and is filled with iron (Fe) as shown in the…
- A resistance of 2 Ω is connected across one gap of a metre-bridge (the length of the wire is 100 cm) and an unknown…
- The potential difference applied to an X-ray tube is 5kV and the current through it is 3.2 mA. Then the number of…
- Shown in figure is a post office box. In order to calculate the value of external resistance, it should be connected…
- In the given circuit R B = 6Ω, R C = 3Ω, R D = 1Ω. The ratio of current through resistors C, B and D will be in the…
- Statement–1 : If the current in the lamp decreases by 20%, the percentage decrease in its illumination is 40%…
- Statement–1 : In a simple battery circuit the point of lowest potential is negative terminal of battery. Statement–2 …
- What is the equivalent resistance of the network across points A and B shown in figure below.
- Statement–1 : Two unequal resistors are connected in series across a cell. Then the potential drop across the larger…
- Statement–1 : At cryogenic temperatures, the electrical resistivity in metallic conductors diminishes. Statement–2 …
- A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the…
- The resistance of all the wires between any two adjacent dots is R. The equivalent resistance between A and B as shown…
- Figure shows three resistor configurations R 1 and R 2 and R 3 connected to 3 V battery. If the power dissipated by the…
- A meter bridge is set-up as shown, to determine an unknown resistance X using a standard 10 ohm resistor. The…
- A Galvanometer is an instrument that can be used to construct an ammeter for measuring current .It can be used…
- A Galvanometer is an instrument that can be used to construct an ammeter for measuring current .It can be used…
- Heater of an electric kettle is made of a wire of length L and diameter d . It takes 4 minutes to raise the temperature…
- To verify Ohm’s law, a student is provided with a test resistor R T , a high resistance R 1 , a small resistance R 2 …
- Capacitor C 1 of capacitance 1 micro-farad and capacitor C 2 of capacitance 2 microfarad are separately charged fully…
- In the given circuit, it is observed that the current I is independent of the value of the resistance R 6 . Then the…
- A Galvanometer is an instrument that can be used to construct an ammeter for measuring current .It can be used…
- A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat…
- In the circuit shown in figure the current through
- The effective resistance between points P and Q of the electrical circuit shown in the figure is
- The potentiometer basically consists of a uniform wire of resistance R through which a steady current flows when a…
- The potentiometer basically consists of a uniform wire of resistance R through which a steady current flows when a…
- Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in…
- In the given circuit, with steady current, the potential drop across the capacitor must be
- Bohr and Biot purchased two electric kettles A and B of the same size and thickness and same volume of 0.4 litre. They…
- The figure shows a circuit having eight resistances of 1 W each, labelled R 1 to R 8 , and two ideal batteries with…
- Statement–1 : When the battery is short circuited the terminal potential difference is zero. Statement–2 : In the…
- Statement–1 : The drift velocity of electrons in metallic wire will decrease if the temperature of the wire is…
- Statement-1 : In a Meter Bridge experiment, null point for an unknown resistance is measured. Now the unknown…
- The electrical resistance between points A and B of the figure shown is
- Consider a thin square sheet of side L and thickness t , made of a material of resistivity r . The resistance between…
- A physical quantity is defined as S = E imes B _ 0 , where, is electric field, is magnetic field and m 0 is the…
- Six identical resistors are connected as shown in the figure. The equivalent resistance will be
- A potential difference is applied across a copper wire of radius 0.5 mm. It results in a uniform electric field of 1.5…
- An incandescent bulb has a thin filament of tungsten that is heated to high temperature by passing an electric current…
- A quantity X is given by where e 0 is the permittivity of the free space, L is a length, D V is a potential difference…
- In the circuit shown the resistances are given in ohms and the battery is assumed to be ideal with e.m.f. equal to 3.0…
- A potential difference is applied across a copper wire of radius 0.5 mm. It results in a uniform electric field of 1.5…
- The current i in the circuit (see fig) is
- Statement–1 : Current density at any point in ohmic resistor is in the direction of electric field at that point…
- Statement–1 : Voltmeter always gives e.m.f. of a cell if it is connected across the terminals of a cell. Statement–2 …
- In the circuit shown the resistances are given in ohms and the battery is assumed to be ideal with e.m.f. equal to 3.0…
- In the circuit P ≠ R , the reading of the galvanometer is same with switch S open or closed. Then
- Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value to zero as…
- A microammeter has a resistance of 100 Ω and a full scale range of 50 μA. It can be used as a voltmeter or as a higher…
- A parallel combination of 0.1 MΩ resistor and a 10 mF capacitor is connected across a 1.5 V source of negligible…
- In circuit-1 and circuit-2 shown in the figures, R 1 = 1Ω, R 2 = 2Ω and R 3 = 3Ω. P 1 and P 2 are the power…
- Find the time constant (in m s) for the given R - C circuits in the given order respectively. R 1 = 1 W , R 2 = 2 W ; C…
- A battery of internal resistance 4Ω is connected to the network of resistances as shown. In order that the maximum…
- This question has Statement-I and Statement-II. Of the four choices given after the statements, choose the one that…
- Two sources of equal emf are connected to an external resistance R. The internal resistances of the two sources are R 1…
- In the circuit shown in fig the heat produced in the 5 ohm resistor due to the current flowing through it is 10 calorie…
- Bohr and Biot purchased two electric kettles A and B of the same size and thickness and same volume of 0.4 litre. They…
- For the circuit shown in the figure
- Two identical moving coil galvanometers have 10 Ω resistance and full scale deflection at 2 μA current. One of them is…
- A Galvanometer is an instrument that can be used to construct an ammeter for measuring current .It can be used…
- A 100 W bulb B 1 and two 60 W bulbs B 2 and B 3 , are connected to a 250 V source, as shown in figure. Now W 1 , W 2…