The magnitude of momentum of electrons in a straight wire o…

Physics Current Electricity General MCQ (Single Correct)

The magnitude of momentum of electrons in a straight wire of copper of length1 meter carrying a current of 16 ampere will be

14.56 × × 10 − − 12 kg m sec − − 1

29.12 × × 10 − − 12 kg m sec − − 1

18.2 × × 10 − − 11 kg m sec − − 1

91 × × 10 − − 12 kg m sec − − 1

Text Solution

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The correct answer is:

If n is the number of electrons per unit volume, then total number of free electrons = nLA

Hence total mass of the electrons = nLA m e

Total momentum of electrons = nLA m e × × v d = nLA m e × ×

= = 91 × × 10 − − 12 kg- sec − − 1

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