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(B) According to Ohm's law,the potential difference $V$ across a conductor is directly proportional to the current $I$ flowing through it,provided the

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$E = IR$

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(B) According to Ohm's law,the potential difference $V$ across a conductor is directly proportional to the current $I$ flowing through it,provided the physical conditions remain constant.$V = IR$In this circuit,the cell provides an electromotive force $(e.m.f.)$ $E$,which acts as the potential difference across the resistance $R$ of the ammeter.Therefore,substituting $E$ for $V$,we get:$E = IR$

An electric wire is connected across a cell of $e.m.f.$ $E$. The current $I$ is measured by an ammeter of resistance $R$. According to Ohm's law,which of the following relations is correct?

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