Current Electri...

The ratio of lengths and diameters of two resistance wires of the same material are 4: 1 and 2: 1 respectively. The two wires are connected in the left and right gaps of Wheatstone's metre bridge. Find the distance of the null point from the left end of the wire.

Potential gradient remains constant until

The power factor of a circuit in which a box having unknown electrical devices connected in series with a resistor of resistance $$3\Omega$$ is $$3/5$$. The reactance of the box is

Two cells of e.m.f. 10$$\mathrm { V } \& 15 \mathrm { V }$$ are connected in parallel to each other between points A $$\& \mathrm { B }$$ .The cell of e.m.f. 10$$\mathrm { V }$$ is ideal but the cell of e.m.f. 15$$\mathrm { V }$$ has internal resistance 1$$\mathrm { \Omega }$$ . The equivalent e.m.f. between $$\mathrm { A }$$ and $$\mathrm { B }$$ is:

If the mean free path of gaseous molecules is $$60cm$$ at a pressure of $$1\times 10^{-4}mm$$ $$Hg$$, what will be its mean free path when the pressure is increased by $$100$$ times at constant temperature?

Meeta connected 4 resistors in parallel. Each has a resistance  of $$ 2 \Omega   $$.  Find the effective resistance .

For a $$DC$$ circuit, Kirchoff's rules yield the following equations.
$$I_{3}=I_{1}+I_{2}$$
$$10 = 3I_{1}-2I_{2}$$
$$50=2I_{2}+9.6I_{3}$$
What is the current $$I_{2}$$ (Amps)?

In the circuit shown, a four-wire potentiometer is made of a $$400 cm$$ long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is $$r = 0.01 \Omega/cm$$. If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected  reading of the voltmeter will be :-

What amount of charge will flow through the battery?

In Fig . I is equal to