A permanent magnet repels
A. ferromagnetic substances only
B. diamagnetic substances only
C. paramagnetic substances only
D. Both B and C
Answer: Option B
A. ferromagnetic substances only
B. diamagnetic substances only
C. paramagnetic substances only
D. Both B and C
Answer: Option B
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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