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) Newtonrsquo;s law of motion
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
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
4. The instrument that is commonly used to study wavefront is :
(a) voltmeter
(b) ammeter
(c) Bragg’s spectrometer
(d) multimeter
5. The angular velocity of an alternating supply having a frequency of 50 Hz.
(a) 2 rad/s
(b) 314 rad/s
(c) 1000 rad/s
(d) 20.2 rad/s
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