Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 9

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In the circuit shown here, the point ' $C$ ' is kept connected to point $A$ '' till the current flowing through the circuit becomes constant. Afterward, suddenly, point ' $C$ ' is disconnected from point $A$ '' and connected to point ' $B$ ' at time $t = 0$ . Ratio of the voltage across resistance and the inductor at $t = \frac{L}{R}$ will be equal 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 10

An emf of

20 V

is applied at time

t = 0

to a circuit containing in series

10 m H

inductor and

5 Ω

resistor. The ratio of the currents at time

t = \infty

and at

t = 40 s

is close to: (Take

e^{2} = 7.389

)

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 11

A series

L - R

circuit is connected to a battery of emf

V

. If the circuit is switched on at

t = 0

, then the time at which the energy stored in the inductor reaches

(\frac{1}{n})

times of its maximum value, is :

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 12

A coil of

40 H

inductance is connected in series with a resistance of

8 Ω

and the combination is joined to the terminals of a

2 V

battery. The time constant of the circuit is,

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 13

Which of the following remain constant in a transformer ?

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 14

A coil having an inductance of

\frac{1}{π} henry

is connected in series with a resistance of

300 Ω

. If

20 volts

from a

200

cycle source is impressed across the combination, the value of the phase angle between the voltage and the current is,

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

In an

L R

series circuit

(L = \frac{175}{11} mH and R = 12 Ω)

, a variable emf source

(V = V_{0} sinω t) of V_{rms} =130 \sqrt{2} V

and frequency

50 Hz

is applied. The current amplitude in the circuit and phase of current with respect to voltage are, respectively

(use, π = \frac{22}{7})

,

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 16

An alternating voltage

E

(in

volt

)

= 200 \sqrt{2} \sin (100 t)

is connected to a

1 μF

capacitor through an AC ammeter. The reading of the ammeter shall be,

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 17

An

AC

circuit has

R = 100 Ω, C = 2 μ F

and

L = 80 mH,

connected in series. The quality factor of the circuit is :