A current of 10 amperes is maintained in a conductor of cross-section of 10-4 m2. If the electron density is 9 x 1028 m-3, what is the drift velocity of free electrons ?

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6.9 x 10-6 ms-1

6.9 x 10-4 ms-1

6.9 x 105 ms-1

None of these

answer is A.

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