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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A voltmeter having resistance of `1800 Omega` is employed to measure the potential difference across `200 Omega` resistance which is connected to DC power supply of 50 V and internal resistance `20 Omega`. What is the percentage change in potential difference across `200 Omega` resistance as a result of connecting voltmeter across it ?

A voltmeter having resistance of `1800 Omega` is employed to measure the potential difference across `200 Omega` resistance which is connected to DC power supply of 50 V and internal resistance `20 Omega`. What is the percentage change in potential difference across `200 Omega` resistance as a result of connecting voltmeter across it ?

if one decides to balance a resistance of 4X against Y? In a meter bridge experiment the null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X< Y then where will the new position of the null point be from the same end