Current Electri...

If the resistivity of a potentiometer wire be p and area of cross-section be A, then what will be potential gradient along the wire?

A voltmeter has resistance of 2000 ohm and it can measure upto 2 V. If we want to increase its range to10 V, then the required resistance in series will be

The arrangement as shown in figure is called as

A potentiometer wire of length 1 m and resistance 10 Ω is connected in series with a cell of e.m.f. 2V with internal resistance 1 Ω and a resistance box including a resistance R. If potential difference between the ends of the wire is 1 mV, the value of R is

In a balanced Wheatstone\'s network, the resistances in the arms Q and S are interchanged. As a result of this

The ammeter A reads 2 A and the voltmeter V reads 20 V. The value of resistance R is (Assuming finite resistance\'s of ammeter and voltmeter)

A galvanometer of 25 Ω resistance can read a maximum current of 6mA. It can be used as a voltmeter to measure a maximum of 6 V by connecting a resistance to the galvanometer. Identify the correct choice in thegiven answers

A galvanometer has 30 divisions and a sensitivity 16 μA/div. It can be converted into a voltmeter to read 3 V by connecting

A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)

In a circuit 5 percent of total current passes through a galvanometer. If resistance of the galvanometer is G then value of the shunt is