A compass needle cannot be used to detect
A. magnetic North-South direction
B. polarity of a magnet
C. strength of a magnet
D. direction of magnetic field
Answer: Option C
A. magnetic North-South direction
B. polarity of a magnet
C. strength of a magnet
D. direction of magnetic field
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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