A rectangular coil of copper wire is rotating in a magnetic field. The direction of the induced current changes once in each?
A. Two revolutions
B. One revolution
C. Half revolution
D. One fourth revolution
Answer: Option C
A. Two revolutions
B. One revolution
C. Half revolution
D. One fourth revolution
Answer: Option C
What will be the total resistance of the three 20-Ω coils connected in series?
A. 40 Ω
B. 20 Ω
C. 60 Ω
D. 800 Ω
Superconductors are substances which
A. conduct electricity at lower temperature
B. offer high resistance to the flow of current
C. offer not resistance to the flow of current
D. conduct electricity at high temperature
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