A voltmeter is connected across a battery of emf 12 V and internal resistance of 10 Q. If the voltmeter resistance is 230 Q, what reading will be shown by voltmeter?

The resistance of an ideal voltmeter is

A voltmeter having a resistance of 50 Omega is connected across a cell of e.m.f. 2V and internal resistance 10 Omega . The reading of the voltmeter,

A lead resistance R is connected across a cell of emf E and internal resistance r. If the closed circuit p.d. across the terminals of the cell is V the internal resistance of the cell is.

A potentiometer has a uniform wire of length 10 m and resistance 5 Omega . The potentiometer is connected to an external battery of e.m.f. 10V and negligible internal resistance and an external resistance of 995 Omega in series.The potential gradient along the wire is

A potentiometer wire has a length 10 m and a resistance 20 Omega . Its terminals are connected to a battery of e.m.f. 4 V and internal resistance 5 Omega . What are the distances at which null points are obtained when two cells of e.m.f.s 1.5 V and 1.3 V are connected so as to assist ?

A potentiometer wire has a length 10 m and a resistance 20 Omega . Its terminals are connected to a battery of e.m.f. 4 V and internal resistance 5 Omega . What are the distances at which null points are obtained when two cells of e.m.f.s 1.5 V and 1.3 V are connected so as to oppose each other ?

A potentiometer wire of length 10 m and resistance 9 ohm is connected to a battery of e.m.f. 2.1 volt having internal resistance 1.5 Omega . Find the potential gradient along the wire and the balancing length for a cell of e.m.f. 1.08 volt .

Choose correct alternative. Two resistance of 3 Omega and 2 Omega are connected in series to a cell of emf 3 volt and internal resistance of 1 Omega . The potential difference across 3 Omega resistance will be A. 1 volt B. 0.5 volt C. 1.5 volt D. 2 volt

A 50V battery is connected across a 10 ohm resistor. The current is 4.5 amperes. The internal resistance of the battery is