InterviewSolution
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InterviewSolution
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How can we decide the direction of electric current in a conductor ? |
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Answer» Solution :We know `I=nqAv_(d).` In this n and A are positive. Hence the DIRECTION of current is determined by the signs of the charge 'q' and drift speed`v_(d).` 1. For electrons, q is NEGATIVE and `v_(d)` is positive. Then the PRODUCT of q and `v_(d)` is negative. So the direction of electric currentis opposite to the flow of negative charge. 2. For positive charges, the product of q and `v_(d)` is positive. Hence, the direction of electric current can be taken as the direction of flow of positive charges. |
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