Current Electri...

When battery and galvanometer are interchanged in the case of Wheatstone bridge, then?

In the circuit shown in the figure, the voltage across $$15\Omega$$ resistor is $$30$$V having the polarity as indicated. What is the value of R?

When the switch is closed, the initial current through the $$1\Omega$$ resistor is?

Two cells of e.m./f.s $$ E_{1} $$ and $$ E_{2} $$ $$ (E_{1}> E_{2}) $$ are connected as shown  Fig. 6.45  
When a potentiometer is connected between A and B, the balancing length of the potentiometer wire is 300 cm. On connecting the same potentiometer between A and C, the balancing length is 100 cm. The ratio $$ E_{1}/E_{2} $$ is

The ratio $$R_{2}/R_{3}$$ is

In a meter bridge experiment, null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If $$ X< Y $$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4 X against Y

When temperature of the conductor is increased, then the collision frequency between current carries ( electrons ) and atoms increases. This results in

The equivalent resistance between $$A$$ and $$B$$ in the network in figure is 

The ratio $$R_{1}/R_{2}$$ is

In Fig. when an ideal voltmeter is connected across 4000$$\Omega $$ resistance, it reads 30 V. If the voltmeter is connected across 3000$$\Omega $$ resistance, it will read