# Electromagnetic Induction – Exercise – 1

1. The mechanical energy spent by the external agency is converted into electrical energy stored in the coil. This relates to :

(a) Ohm’s law
(b) Coulomb’s law
(c) Lenz’s law
(d) Newton’s law of motion

Explanation
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2. A magnetic field of induction 10 tesla acts along the axis of a coil of area 10 m2 with 20 turn. The magnetic flux linked with the coil is :

(a) 1000 turn
(b) 50 turn
(c) 500 turn
(d) 2000 turn

Explanation
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3. K is coefficient coupling between the coils. If it is less than one, then the coupling between the coils is :

(a) loose
(b) medium
(c) zero
(d) tight

Explanation
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4. The instrument that is commonly used to study wavefront is :

(a) voltmeter
(b) ammeter
(c) Bragg’s spectrometer
(d) multimeter

Explanation
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5. The angular velocity of an alternating supply having a frequency of 50 Hz.