According to Ohm's law, which of the following statements is true?
A. The amount of electric current flowing in a wire is inversely proportional to the length of the wire
B. The amount of electric current flowing in a wire is proportional to the voltage difference between the ends of the wire
C. The amount of current flowing in a wire is inversely proportional to the voltage difference between the ends of the wire
D. The amount of electric current flowing in a wire is proportional to the resistance of the wire
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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