Question

why should a test charge be of negligibly small magnitude​

Answer 1

Answer: The magnitude of the test charge must be small enough so that it does not disturb the distribution of the charges whose electric field we wish to measure otherwise the measured field will be different from the actual field.

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Answer 2

Answer:

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.