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

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,…

The equivalent resistance of the following circuit is nearly

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…

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,…

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 :

The length of a potentiometer wire is 1 . A cell of emf $E$ is balanced at length $1 / 3$ from the positive end of the wire. If the length of the wire is increased by $1 / 2$. Then, at what distance will the same cell…

Find the equivalent resistance across $A B$

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

Consider the cylindrical element as shown in the figure. Current flowing the through element is $I$ and resistivity of material of the cylinder is $\rho$. Choose the correct option out the following.