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

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?

V 1 = 300 V , V 2 = 300 V , V 3 = 300 V

V 1 = 100 V , V 2 = 100 V , V 3 = 100 V

V 1 = 250 V , V 2 = 0 V , V 3 = 150 V

V 1 = 300 V , V 2 = 100 V , V 3 = 100 V

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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Which of the following remain constant in a transformer ?

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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 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

AC

circuit has

R = 100 Ω, C = 2 μ F

and

L = 80 mH,

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

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Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 3>Q 18

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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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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Which of the following remain constant in a transformer ?

Important Questions on Electromagnetic Induction and Alternating Currents

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