A circuit connected to an ac source of emf e = e 0 sin ⁡ 100 t with t in seconds, gives a phase difference of π 4 between the emf e and current i . Which of the following circuits will exhibit this?

R C circuit with R = 1 k Ω and C = 10 μ F

R C circuit with R = 1 k Ω and C = 1 μ F

R L circuit with R = 1 k Ω and L = 1 m H

R L circuit with R = 1 k Ω and L = 10 m H

An electric generator is based on_____

Faraday's laws of electromagnetic induction

Motion of charged particles in an electromagnetic field

Fission of Uranium by slow neutrons

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An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to:

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Important Questions on Electromagnetic Induction and Alternating Currents

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 19

A circuit connected to an ac source of emf

e = e_{0} \sin (100 t)

with

t

in seconds, gives a phase difference of

\frac{π}{4}

between the emf

e

and current

i

. Which of the following circuits will exhibit this?

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 20

A sinusoidal voltage with a frequency of

50 Hz

is applied to a series

L C R

circuit with a resistance of

5 Ω

, inductance of

20 mH

and a capacitance of

500 μ F

. The magnitude of impedance of the circuit is close to

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 21

Three identical emf sources are attached to a single circuit element: a resistor, a capacitor, or an inductor. The current amplitude is then measured as a function of frequency. Which one of the following curve corresponds to inductive circuit?

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 22

The figure shows an LCR network connected to a $300 V$ $A C$ supply. The circuit elements are such that $R = X_{L} =$ $X_{C} = 10 Ω .$ Three voltmeters $V_{1}, V_{2}$ and $V_{3}$ are connected as shown. Which of the following represents the correct set of readings of the voltmeters?

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 23

If emf

E = 4 \cos 1000 t v o l t

is applied to an

L - R

circuit of inductance

3 mH

and resistance

4 Ω,

the amplitude of current in the circuit is

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 24

In an AC circuit, the current flowing is

I = 5 \sin (100 t - \frac{π}{2}) A

and the potential difference is

e = 200 \sin (100 t)

. The power consumption is equal to

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 25

A generator produces a voltage that is given by

V = 240 V \sin (120 t)

, where

t

is in

seconds

. The frequency and r.m.s. voltage are

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 26

The peak value of an alternating e.m.f given by

E = E_{0} \cos ω t,

10 V

and frequency is

50 Hz .

At time

t = (\frac{1}{600}) \sec,

the instantaneous value of e.m.f is:

An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to:

Important Questions on Electromagnetic Induction and Alternating Currents

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