Which of the following is not true about electromagnetic?
A. It is a temporary magnet
B. its capacity varies between its poles
C. cannot be polarized
D. Its capacity can be changed
Answer: Option C
A. It is a temporary magnet
B. its capacity varies between its poles
C. cannot be polarized
D. Its capacity can be changed
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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