Potential difference - in definition it is said that the work done to shift unit positive charge from one point to other. Why it is unit positive charge, why not unit negative charge. Pl explain.

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Solution

It is a convention that a test charge is taken as positive.
Now if we had defined it as work done in moving a negative unit charge than the positive charge would attract the negative charge towards itself and thus we won’t get a scope to work against the field.

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Potential difference - in definition it is said that the work done to shift unit positive charge from one point to other. Why it is unit positive charge, why not unit negative charge. Pl explain.

It is a convention that a test charge is taken as positive. Now if we had defined it as work done in moving a negative unit charge than the positive charge would attract the negative charge towards itself and thus we won’t get a scope to work against the field.

It is a convention that a test charge is taken as positive.
Now if we had defined it as work done in moving a negative unit charge than the positive charge would attract the negative charge towards itself and thus we won’t get a scope to work against the field.