Magnetism in materials is due to
A. electrons at rest
B. circular motion of electrons
C. protons at rest
D. all neutrons at rest
Answer: Option B
A. electrons at rest
B. circular motion of electrons
C. protons at rest
D. all neutrons at rest
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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