Current Electricity — practice questions
52 curated practice questions from Current Electricity (Physics NEET, NTA Exams) — 28 easy, 9 hard, 15 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- I -V characteristic of a copper wire of length L and area of cross-section A is shown in figure. The slope of the curve…
- A 6 V battery is connected to the terminals of a three meter long wire of uniform thickness and resistance of 100 Ω…
- The temperature coefficient of resistance of wire is 0.00125 " C -1 . At 300 K, its resistance is 1 Ω. At what…
- When three identical bulbs of 60 W, 200 V rating are connected in series to a 200 V supply, the power drawn by them…
- Two bulbs rated 25 W - 220 V and 100 W - 220 V are connected in series to a 440 V supply. Then,
- The Kirchoff's first law [ i =0 ] and second law ( i R= E ) where the symbol have their usual meanings, are…
- Two 220 V, 100 W bulbs are connected first in series and then in parallel. Each time the combination is connected to a…
- The resistance of platinum wire at 0°C is 2 and 6.8 at 80°C. The temperature coefficient of resistance of the wire is:
- n identical bulbs, each designated to draw a power P from a certain voltage supply. The total power which they will…
- In a neon gas discharge tube 2.9 10^ 16 Ne ^ + ions move to the right through a cross-section of the tube per second…
- In a meter bridge experiment, point is obtained at 20 cm from one end of the wire when resistance X is balanced against…
- Various experiments are performed on a resistance wire of 0.5 m length. In which of the following experiments the heat…
- The three resistances of equal value are arranged in the different combinations shown in the figure. Arrange them in…
- The resistance of a wire at 300 K is found to be 0.3 Ω. If the temperature coefficient of resistance of wire is 1.5 x…
- Flash light equipped with a new set of batteries, produces bright white light. As the batteries wear out [AIIMS 2006]
- The water in an electric kettle begins to boil in 15 minutes after being switched on. If the water is required to be…
- An electric current is passed through a circuit containing two wires of the same material connected in parallel. If the…
- 10 resistance each of resistance R are connected in series to a battery of emf E and negligible internal resistance…
- A wire when connected to 220 V main supply has power dissipation P 1 . Now the wire is cut into two equal pieces which…
- The current in a simple series circuit is 5.0 A. When an additional resistance of 2.0 Ω is inserted, the current drops…
- In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also…
- The resistance of a wire is 5 ohm at 50 " C and 6 ohm at 100 " C . The resistance of the wire at 0 " C will be
- A material 'B' has twice the specific resistance of 'A'. A circular wire made of 'B' has twice the diameter of a wire…
- At room temperature, copper has free electron density of 8.4 10^ 24 ~m ^ -3 . The electron drift velocity in a copper…
- Given below are two statements: one labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) …
- 10,000 alpha particles per minute are passing through a straight tube of uniform radius 2 cm. The resulting electric…
- Two electric bulbs marked 25W — 220 V and 100 W — 220 V are connected in series to a 440 V supply. Which of the bulbs…
- Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of…
- STATEMENT - 1: The temperature dependence of resistance is usually given as R=R_ a (1+m t) . The resistance of a wire…
- A 5.0 amp current is setup in an external circuit by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of…
- Two resistance are connected in two gaps of a metre bridge. The balance point is 20 cm from the zero end. A resistance…
- An electric current flows through a conducting wire when the wire is connected to a battery. When the battery is…
- The potential difference (V A -V B ) between the points A and B in the given figure is: A I=2 a V_ A =2 + B 3 V + B 1…
- The temperature coefficient of resistance of a wire is 0.00125 / " C . Its resistance is 1 ohm at 300 K. Its resistance…
- The resistance of a bulb filament is 100 at a temperature of 100 "C . If its temperature coefficient of resistance be…
- A current of 5 A is passing through a metallic wire of cross-sectional area 4 10^ -6 ~m ^ 2 . If the density of charge…
- Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in…
- According to Joule's law, if the potential difference across a conductor having a material of specific resistance (ρ)…
- Which of the following acts as a circuit protecting device?
- The thermo emf of a thermocouple is 25 V ^ C at room temperature. A galvanometer of 40 Ω, capable of detecting current…
- ______ laws assert that the electric field lines cannot form close loops.
- A current passes through a resistor. If E 1 and E 2 are the average kinetic energies of the conduction electrons and…
- A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method…
- A copper wire of length 10 m and radius ( 10^ -2 ) m has electrical resistance of 10 . The current density in the wire…
- A wire of nichrome and copper of equal length are connected in series in an electrical circuit, then
- In a Wheatstone bridge, three resistances P, Q and R are connected in the three arms and the fourth arm is formed by…
- An unknown resistance R 1 is connected in series with a resistance of 10 Ω. This combination is connected to one gap of…
- Two conductors have the same resistance at 0℃ but their temperature coefficients of resistance are α 1 and α 2 . The…
- A battery with emf =2.6 ~V loaded with an external resistance produces a current i =1.0 ~A . In this case the potential…
- Given below are two statements Statement I : Voltmeter is connected in parallel with the circuit. Statement II …
- In a building there are 15 bulbs of 45 W, 15 bulbs of 100 W, 15 small fans of 10 W and 2 heaters of 1 kW. The voltage…
- Resistance in the two gaps of a meter bridge are 10 ohm and 30 ohm respectively. If the resistances are interchanged…