Current Electricity

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

The equivalent resistance of the following circuit is nearly

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…

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,…

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

A current of 2 A flows in the system of conductors as shown in the figure. The potential difference $V_P-V_R$ will be :

A voltmeter of resistance $998 \Omega$ is connected across a cell of emf 2 V and internal resistance $2 \Omega$. The potential difference, across the voltmeter is

Find the equivalent resistance across $A B$

In the figure a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is

In the following circuit reading of voltmeter $V$ is