Current Electricity Quiz 1

When the current in a potentiometer wire decreases, the potential gradient

The accuracy of a potentiometer wire can be increased by

A cell of emf 1.1 V and internal resistance r is connected across an external resistor of resistance R = 10 r. The potential difference across the resistor is

When a metal conductor connected in the left gap of a metre bridge is heated, the null point

In using a Wheatstone’s bridge to accurately measure an unknown resistance, a calibrated known variable resistor is varied until

In a Wheatstone network, the resistances in cyclic order are P = 10 $\Omega$, Q = 5 $\Omega$, S = 4 $\Omega$ and R = 4 $\Omega$. Then, for the bridge to balance,

Two resistors, $R_1$ and R, are connected in the left gap and the right gap of a metre bridge, and the balancing length is obtained at 20 cm from the left. On inter-changing the resistors in the two gaps, the balancing length shifts by

An instrument which can measure terminal potential difference as well as electromotive force (emf) is

A 10 m long wire of resistance 20 $\Omega$ is connected in series with a resistance of 10 $\Omega$ and a battery of emf 3 V and negligible internal resistance. The potential gradient, in $\mu$V / mm, along the wire is

A 10 m long potentiometer wire has a resistance of 20 $\Omega$. If it is connected in series with a resistance of 55 $\Omega$ and a cell of emf 4 V and internal resistance 5 $\Omega$, the potential gradient along the wire is