Current Electricity

In a Wheatstone's bridge, three resistance 'Q', 'R' and 'S' are connected in three arms and first arm is formed by three resistances '$P_1$', '$P_2$' and '$P_3$' in parallel. The condition for the bridge to be balanced…

The equivalent resistance of the following circuit is nearly

In Wheatstone bridge, resistance P is formed by a parallel combination of $p_1$ and $p_2$. The Q resistance is formed by a parallel combination of $q_1$ and $q_2$. The remaining two resistances are R and S respectively,…

In a Wheatstone's network $P \neq R$, the reading of the galvanometer is the same with a switch 'S' open or closed. Then

A resistance is to be measured using a meter bridge; the student chooses the standard resistance R to be $100\ \Omega$. The student finds the null point at $l_1=16$ cm. To get the null point near the middle of the wire,…

A galvanometer having a coil resistance of $100\ \Omega$ gives a full scale deflection when a current of $1$ mA is passed through it. The value of the resistance which can convert this galvanometer into ammeter giving a…

The power dissipated in the circuit shown in the figure is 30 Watts. The value of $R$ is

The current passing through the 100$\Omega$ resistor in the given electrical circuit is :

In the given circuit, an ideal voltmeter connected across $6\Omega$ reads 5V. The internal resistance r of each cell is:

The equivalent resistance of the infinite network given below is:

The reading of an ideal voltmeter in the circuit shown is

In the circuits shown below, the readings of the voltmeters and the ammeters will be,