1. a copper conductor of length 10cm and radius 1.5mm is connected in parallel to an ammeter having a resistance of 0.03ohm. find the current in the circuit if the ammeter indicates 0.4A . the resistivity of copper is 1.78 * 10-8 .

Resistance of the copper rod:

As the ammeter and the copper rod are parallel to each other, thus the potential drop across them is equal.

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