Electromagnetic Induction & Alternating Currents (AIIMS Physics): Questions 42 - 45 of 51

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Question number: 42

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

Appeared in Year: 2006

MCQ▾

Question

A coil of inductive reactance 31Ω has a resistance of 8Ω . It is placed in series with a condenser of capacitative reactance 25Ω . The combination is connected to an a. c. source of 110 volt. The power factor of the circuit is – (AIPMT)

Choices

Choice (4) Response
a.

0.56

b.

0.80

c.

0.64

d.

0.33

Question number: 43

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

A choke coil consists of 150 turns wound on a high permeability core. If the relative permeability is 3540, permeability of free space is 1.26×106Hm , coil length is 5 cm and cross section area is 5×104m2 then the value of the inductance of coil is –

Choices

Choice (4) Response
a.

3H

b.

1H

c.

20H

d.

8H

Question number: 44

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

A rod of magnetic material having dimension 15cm×0.4cm×0.3cm is subjected in magnetizing field of 0.3×104Am then a magnetic moment of 8Am2 is induced in it. Therefore magnetic induction in rod is –

Choices

Choice (4) Response
a.

5.59wbm2

b.

4.87wbm2

c.

6.2wbm2

d.

7.2wbm2

Question number: 45

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

Appeared in Year: 1995

MCQ▾

Question

Dimension of a rectangular coil is 20cm×10cm . Number of turns in coil is 60. It is rotating about its one of the diameter in an uniform magnetic field of 0.5T , with the speed 1800 r. p. m. the maximum induced emf is – [RPMT]

Choices

Choice (4) Response
a.

118V

b.

98V

c.

100V

d.

113 V

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