Current Electri...

For the post office box arrangement to determine the value of unknown resistance, the unknown resistance should be connected between

In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R will be

In a meter bridge experiment, the ratio of the left gap resistance to right gap resistance is 2 : 3, the balance point from left is

When a metal conductor connected to the left gap of a meter bridge is heated, the balancing point

The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer (in ohm) is

An unknown resistance R₁ is connected in series with a resistance of 10 Ω. This combination is connected to one gap of meter bridge while a resistance R₂ is connected in the other gap. The balance point is at 50 cm. Now, when the 10 Ω resistance is removed the balance point shifts to 40 cm. The value of R₁ (in ohm) is

In the given circuit, the voltmeter records 5 V. The resistance of the voltmeter in ohm is

A moving coil galvanometer has a resistance of 10 and full scale deflection of 0.01 A. It can be converted into voltmeter of 10V full scale by connecting into resistance of

Potentiometer wire of length 1 m is connected in series with 490Ω resistance and 2 V battery. If 0.2 m Vcm^-I is the potential gradient, then resistance of the potentiometer wire is

A current of 0.01 mA passes through the potentiometer wire of a resistivity of 10⁹ Ω-cm and area of cross-section 10^-2cm². The potential gradient is