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.Management Sciences
Category: Electromagnetic Induction
Lenz’s law is a consequence of the law of conservation of__________?
0
A. induced current
B. charge
C. energy
D. induced e.m.f.
If current in a conductor increases then according to Lenz’s law self-induced voltage will____________?
A. aid the increasing current
B. tend to decrease the amount of cur-rent
C. produce current opposite to the in-creasing current
D. aid the applied voltage
Which circuit element(s) will oppose the change in circuit current ?
A. Resistance only
B. Inductance only
C. Capacitance only
D. Inductance and capacitance
The practical illustration of the phenomenon of mutual induction is____________?
A. A.C generator
B. D.C dynamo
C. induction coil
D. transformer
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________?
A. 5 mH
B. 10 mH
C. 5 H
D. 10 H
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?
A. 50 ohms
B. 500 ohms
C. 1000 ohms
D. 5000 ohms
Transformer works on the principle of________________?
A. Lenzs law
B. Faradays law
C. Mutual induction
D. Law of conservation of power
Magnetic compass needle will be deflecting if it is kept near________________?
A. Static charge
B. Soft iron
C. Semi-conductor
D. Accelerating charge
A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?
A. A torque about horizontal axis
B. A torque about vertical axis
C. An upward force along the axis
D. No resultant force
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