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21. Commercial electric motors do not use (NTSE Chandigarh, Stage-I, 2014-15)
An electromagnet to rotate the armature
Effectively large no. of turns of conducting wire in the current carrying coil
A permanent magnet to create the armature
A soft iron core on which the coil is wound
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22. Lenz's law is a consequence of the law of conservation of (NTSE Rajasthan, Stage-I, 2014-15)
Momentum
Charge
Angular momentum
Energy
23. The magnetic field lines inside a long current carrying solenoid are nearly (NTSE Delhi, Stage-I, 2014-15)
Circular
Parabolic
Straight
Elliptical
24. An AC generator is connected to an electric appliance. In 10 revolutions of the armature the current in the appliance changes direction (NTSE Delhi, Stage-I, 2014-15)
5 times
10 times
20 times
40 times
25. The energy transformation in Mixie and Grinder is (NTSE Tamil Nadu, Stage-I, 2014-15)
Electrical to heat energy
Electrical to mechanical energy
Electrical to sound energy
Electrical to light energy
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