Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 2>Q 16

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A series $L R$ circuit is connected to a voltage source with $V (t) = V_{0} \sin (ω t)$ . After a very large time, current $I (t)$ behaves as $(t_{0} ≫ \frac{L}{R})$ :

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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 2>Q 17

When the rms voltages

V_{L}, V_{C}

and

V_{R}

are measured respectively across the inductor

L,

the capacitor

C

and the resistor

R

in a series

L C R

circuit connected to an

A C

source, it is found that the ratio

V_{L} : V_{C} : V_{R} = 1 : 2 : 3.

If the rms voltage of the

A C

source is

100 V,

then

V_{R}

is close to :

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 2>Q 18

For the LCR circuit, shown here, the current is observed to lead the applied voltage. An additional capacitor

C^{'}

, when joined with the capacitor C present in the circuit, makes the power factor of the circuit unity. The capacitor

C^{'}

, must have been connected in:
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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 2>Q 19

An alternating voltage of

220 V, 50 Hz

frequency is applied across a capacitor of capacitance

2 μF .

The impedance of the circuit is

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 2>Q 20

In a certain circuit, current changes with time according to

i = 2 \sqrt{t}

. The RMS value of current between

t = 2

to

t = 4 s

will be

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 2>Q 21

An alternating current is given by the equation

i = i_{1} \cos ω t + i_{2} \sin ω t .

The rms current is given by

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 2>Q 22

The current graph for resonance in

LC

circuit is

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 2>Q 23

In the given LCR circuit, the readings of voltmeter and ammeter will, respectively, be?

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 2>Q 24

A coil of inductance

L

has an inductive reactance of

X_{L}

in an

a . c .

circuit in which the effective current is

I

. The coil is made from a super conducting material and has no resistance. The rate at which power is dissipated in the coil is -