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Ohms Law - Questions and Answers

Practice questions on Ohms Law.

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16. A wire has a length of 1 m, area of cross section of 0.5 mm2 and specific resistance of 50  10-8 Ωm. The resistance of the wire is
A. 10 Ω
B. 5 Ω
C. 1 Ω
D. 20 Ω
Explanation:
17. At constant temperature, the current flowing in a conductor is proportional to potential difference between the ends. This is
A. Joule’s law
B. Faraday’s law
C. Lenz’s law
D. Ohm’s law
Explanation:
18. The resistance of a conductor with a diameter of 2 mm is 20 Ω. If the diameter is doubled with length remaining the same, the resistance becomes
A. 5 Ω
B. 10 Ω
C. 30 Ω
D. 40 Ω
Explanation:
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