Electromagnetic Induction & Alternating Currents (AIIMS Physics): Questions 31 - 35 of 51

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Question number: 31

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

The current passing through a choke coil of 9 H is decreasing at the rate of 3amperesecond . The emf developing across the coil is –

Choices

Choice (4) Response
a.

27 V

b.

-27 V

c.

3 V

d.

– 3.0 V

Question number: 32

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

The reactance of an inductance of 0.05H for 100 Hz A. C. is –

Choices

Choice (4) Response
a.

31.4 Ω

b.

6.28 Ω

c.

3.14 Ω

d.

62.8 Ω

Question number: 33

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

The impedance of a circuit, when a resistance 2KΩ and a capacitor of capacitance 1μF are connected in series in an A. C. circuit of frequency 50 Hz is –

Choices

Choice (4) Response
a.

15.33×103Ω

b.

3.75×103Ω

c.

21.0×103Ω

d.

10.13×103Ω

Question number: 34

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

Appeared in Year: 1997

MCQ▾

Question

A coil of copper having 900 turns is placed in a magnetic field (B=3×103T) perpendicular to its plane. The cross sectional area of the coil is 0.5 m2. If it turns through 180° in 0.02 sec, then the induced emf in the coil is –

Choices

Choice (4) Response
a.

135 V

b.

35 V

c.

0.4 V

d.

0.2 V

Question number: 35

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A conducting ring of radius 2 meter is placed in a uniform magnetic field B of 0.04 T, oscillating with frequency 500 Hz with its plane at right angles to magnetic field. What will be the induced electric field?

Choices

Choice (4) Response
a.

50voltsm

b.

160voltsm

c.

70voltsm

d.

120voltsm

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