Question

the test charge used to measure electric field intensity at a point should be vanishingly small
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Answer 1

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To measure the electric field at a point, the test charge used should be very small so that it does not change the electric field to be measured and influence the source producing electric field to be measured.

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Answer 2

To measure the electric field at a point, the test charge used should be very small so that it does not change the electric field to be measured and influence the source producing electric field to be measured.

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