The earth's magnetic field is due to
A. currents circulating inside the core
B. presence of a huge magnet at its centre
C. moving charges in space outside
D. None of the above
Answer: Option A
A. currents circulating inside the core
B. presence of a huge magnet at its centre
C. moving charges in space outside
D. None of the above
Answer: Option A
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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