Current Electricity

Question: Resistance of 100 cm long potentiometer wire is 10$\Omega$, it is connected to a battery (2 volt) and a resistance R in series. A source of 10 mV gives null point at 40 cm length, then external resistance R is

1) 490 $\Omega$

2) 790 $\Omega$

3) 590 $\Omega$

4) 990 $\Omega$

Solution:

Explanation: No Explanation

Different Measuring Instruments Potentiometer Meter Bridge

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