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Ohm's Law in Scalar Form

An ammeter, v...

Question

An ammeter, voltmeter and a resistor are connected in series to a cell and the readings are noted as $I$ and $V$ . If another resistor $R$ is connected in parallel with voltmeter, then:

A

I

and

V

increase

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B

I

increases

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C

I

and

V

will remain same

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D

I

decreases

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E

I

remains constant

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Solution

The correct option is B $I$ increases
When the resistor R is connected in parallel with voltmeter, the effective resistance in the circuit decreases because $(\frac{1}{R} = \frac{1}{R_{1}} + \frac{1}{R_{2}})$
Therefore current, $I = \frac{V}{R}$ increases.

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