Electromagnetic Induction and Alternating Currents — practice questions
54 curated practice questions from Electromagnetic Induction and Alternating Currents (Physics NEET, NTA Exams) — 26 easy, 17 hard, 11 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- Given below are two statements Statement I : Emf will always induce whenever there is change in magnetic flux…
- Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?
- In a series LCR circuit, the inductance L is 10 mH, capacitance C is 1 F and resistance R is 100 . The frequency at…
- Power dissipated in an L-C-R series circuit connected to an AC source of emf E is
- In which of the following devices, the eddy current effect is not used?
- A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of…
- The reactance of a capacitor of capacitance C is X. If both the frequency and capacitance be doubled, then new…
- The self inductance of the motor of an electric fan is 10 H. In order to impart maximum power at 50 Hz, it should be…
- The maximum value of AC voltage in a circuit is 707 V. Its rms value is
- If resistance R = 10 Ω, inductance L = 2 mH and capacitance = 5 μF are connected in series to an A.C. source of…
- In a transformer, number of turns in the primary coil are 140 and that in the secondary coil are 280. If current in…
- An alternating current of rms value 10 A is passed through a 12 Ω resistor. The maximum potential difference across the…
- In a LCR series circuit, the potential difference between the terminals of the inductance is 60 V, between the…
- A big circular coil of 1000 turns and average radius 10 m is rotating about its horizontal diameter at 2 rad s -1 . If…
- An AC voltage source of variable angular frequency ω and fixed amplitude V 0 is connected in series with a capacitance…
- The number of turns in the primary and secondary of a transformer are N P and N S respectively. The resistance of the…
- Given below are two statements Statement I : The induced charge that flows in the circuit does not depends on the time…
- The magnetic flux through a loop of resistance 10 Ω is given by = [5 t^ 2 -4 t+1 ] Wb . How much current is induced in…
- In a step-up transformer the ratio of turns of the primary and the secondary is 1 : 25. If the input voltage is 230 V…
- An emf is generated by an ac generator having 100 turn coil, of loop area 1m 2 . The coil rotates at a speed of one…
- In a series LCR circuit, R = 200 Ω and the voltage and the frequency of the main supply is 220 V and 50 Hz…
- Given below are two statements Statement I : The inductive reactance limits amplitude of the current in a purely…
- A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 radians per second. If…
- A circuit has a resistance of 12 ohm and an impedance of 15 ohm. The power factor of the circuit will be
- An ideal transformer has a primary power input of 10 kW. The secondary current when the transformer is on load is 25 A…
- The flux linked with a coil at any instant 't' is given by =10 t^ 2 -50 t+250 . The induced emf at t = 3 s is
- A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic…
- A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil…
- Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon
- A step-down transformer reduces the voltage of a transmission line from 2200 V to 220 V. The power delivered by it is…
- A magnet is allowed to fall through a metal ring. During fall its acceleration will be
- A current of 5 A is flowing at 220 V in the primary coil of a transformer. If the voltage produced in the secondary…
- Given below are two statements Statement I : The power in an ac circuit is minimum if the circuit has only a resistor…
- In the circuit shown below neglecting source resistance, the voltmeter and ammeter readings will respectively be: (240…
- A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitive…
- Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- Given below are two statements Statement I : A capacitor is connected to a direct current source. Its reactance is…
- The impedence of a circuit, when a resistance R and an inductor of inductance L are connected in series to an AC…
- The magnetic flux through a circuit of resistance R changes by an amount in a time t . Then, the total quantity of…
- A train is moving towards north with a speed of 180 km/hr. If the vertical component of the earth's magnetic field is…
- An ideal choke draws a current of 8 A when connected to an AC supply of 100 V, 50 Hz. A pure resistor draws a current…
- A short-circuited coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current…
- An ideal transformer has 500 and 5000 turns in primary and secondary windings respectively. If the primary voltage is…
- When 100 V D.C. is applied across a coil, a current of 1 A flows through it. When 100 V A.C. of 50 Hz is applied to the…
- In a series resonant R-L-C circuit, the voltage across R is 100 V and the value of R = 1000 Ω. The capacitance of the…
- Given below are two statements Statement I : The alternating current lags behind the emf by a plane angle of 2 , when…
- The values of L, C and R for a circuit are 1 H, 9 F and 3 Ω. What is the quality factor of the circuit at resonance?
- An inductance of ( 200 ) mH _ 4 a capacitance of ( 10^ -3 ) F and a resistance of 10 Ω are connected in series with an…
- A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency…
- Two coils have a mutual inductance of 0.005 H. The current changes in first coil according to the equation I=I_ 0 sinut…
- The magnetic energy stored in an inductor of inductance 4 H carrying a current of 2 A is:
- In an LCR circuit, capacitance is changed from C to 2C. For the resonant frequency to remain unchanged, the inductance…
- A coil having N turn and resistance R Ω is connected with a galvanometer of resistance 4R Ω. This is moved in time t…
- A conducting square loop of side I and resistance R moves in its plane with a uniform velocity perpendicular to one of…