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The potentiometer wire AB shown in figur...

The potentiometer wire AB shown in figure is 50cm long.When AD=30cm, no deflection occurs in the galvanmeter.Find R.

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Resistance of 30 meter length = 30r
Resistance of 20 meter length = 20r
`rArr 30r = 20 xx 6 `
` rArr r = 4 Omega ` .
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HC VERMA-ELECTRIC CURRENT IN CONDUCTORS-Exercises
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