Questions in Current Electricity

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A potentiometer consists of a wire of length 4 m and resistance $10\,\Omega $. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be
In a meter bridge, the balancing length from the left end (standard resistance of one ohm is in the right gap) is found to be 20 cm. The value of the unknown resistance is
In the circuit shown $P \ne R$, the reading of the galvanometer is same with switch S open or closed. Then Question Image
In the following Wheatstone bridge $P/Q = R/S$. If key K is closed, then the galvanometer will show deflection Question Image
A galvanometer having a resistance of 8 ohm is shunted by a wire of resistance 2 ohm. If the total current is 1 amp, the part of it passing through the shunt will be
A potentiometer wire has length 10 m and resistance $20\,\Omega $. A 2. 5 V battery of negligible internal resistance is connected across the wire with an $80\,\Omega $ series resistance. The potential gradient on the wire will be
An ammeter whose resistance is $180\,\Omega $ gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is
A galvanometer whose resistance is $120\,\Omega $ gives full scale deflection with a current of 0.05 A so that it can read a maximum current of 10 A. A shunt resistance is added in parallel with it. The resistance of the ammeter so formed is
In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of $6\,\Omega $, the balance is obtained across 50 cm of the wire. The internal resistance of the cell is
A voltmeter of resistance $1000\,\Omega $ gives full scale deflection when a current of 100 mA flow through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full scale deflection is

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