Nichrome wire of lengthland radius 'r has resistance of 100. How would the
resitance of the wire change when (l) only the diameter is doubled? (1) only length
of the wire is doubled?
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Answer:
1) When the diameter is doubled the resistance of the wire reduces by half as the thickness of the wire is inversly proportional to resistance. So the new resistance will be 50 ohm
2) when the length of a wire is doubled the resistance also double as length is directly proportional to resistance. So new resistance will be 200 ohm
Explanation:
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