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.Management Sciences
Category: Electromagnetic Induction
An open coil has_____________?
0
A. zero resistance and inductance
B. infinite resistance and zero inductance
C. infinite resistance and normal inductance
D. zero resistance and high inductance
The inductance of a coil will increase under all the following conditions except______________?
A. when more length for the same number of turns is provided
B. when the number of turns of the coil increase
C. when more area for each turn is provided
D. when permeability of the core increases
Which of the following circuit elements will oppose the change in circuit current ?
A. Capacitance
B. Inductance
C. Resistance
D. All of the above
A.C cannot be used for_______________?
A. producing heat
B. producing light
C. magnetizing and electroplating
D. all the above
An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?
A. 150msec-1
B. 384msec-1
C. 38.4msec-1
D. 200msec-1
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