A battery of e.m.f. E and internal resistance r is connected to an external resistance R the condition for maximum power transfer is

A thin wire of resistance 4 $$\Omega$$ is bent to form a circle. The resistance across any diameter is

A battery of emf E and internal resistance r is connected with an external resistance R as shown in the figure. The battery will act as a constant vo...

Find the equivalent capacitance between A and B of the following arrangement : ...

Three concentric metallic shells A, B and C of radii a, b and c (a < b < c) have surface charge densities +$$\sigma$$, $$-$$$$\sigma$$ and +$$\s...

The carbon resistor with colour code is shown in the figure. There is no fourth band in the resistor. The value of the resistance is...

Two metal wires of identical dimensions are connected in series. If $$\sigma$$1 and $$\sigma$$2 are the electrical conductivities of the metal wires r...

A galvanometer can be converted to a voltmeter of full scale deflection V0 by connecting a series resistance R1 and can be converted to an ammeter of ...

What will be the equivalent resistance between the terminals A and B of the infinite resistive network shown in the figure?...

Consider the circuit shown.If all the cells have negligible internal resistance, what will be the current through the 2$$\Omega $$ resistor when stea...

A pair of parallel metal plates are kept with a separation d. One plate is at a potential + V and the other is at ground potential. A narrow beam of e...

Five identical capacitors, of capacitance 20$$\mu$$F each, are connected to a battery of 150V, in a combination as shown in the diagram. What is the t...

What is the current I shown in the given circuit?...

When the value of R in the balanced Wheatstone bridge, shown in the figure, is increased from 5$$\Omega $$ to 7$$\Omega $$, the value of S has to be i...

A capacitor of capacitance C is connected in series with a resistance R and DC source of emf E through a key. The capacitor starts charging when the k...

Four resistors, 100$$\Omega $$, 200$$\Omega $$, 300$$\Omega $$ and 400$$\Omega $$ are connected to form four sides of a square. The resistors can be c...

What will be current through the 200$$\Omega $$ resistor in the given circuit, a long time after the switch K is made on?...

An electric bulb, a capacitor, a battery and a switch are all in series in a circuit. How does the intensity of light vary when the switch is turn on?

The insulated plates of a charged parallel plate capacitor (with small separation between the plates) are approaching each other due to electrostatic ...

Three capacitors of capacitance 1.0, 2.0 and 5.0 $$\mu$$F are connected in series to a 10 V source. The potential difference across the 2.0$$\mu$$F ca...

Six wires, each of resistance r, are connected so as to form a tetrahedron. The equivalent resistance of the combination when current enters through o...

Consider the circuit shown in the figure.The value of the resistance X for which the thermal power generated in it is practically independent of small...

Consider the circuit shown in the figure where all the resistances are of magnitude 1 k$$\Omega$$. If the current in the extreme right resistance X is...

Consider the circuit given here. The potential difference VBC between the points B and C is...

Two wires each of same material and same length have 2 L 1 ratio of their radii. If the first wire has a resistance of 2 $$\Omega$$ then what will be ...

A 60 W - 220 V bulb is connected in series with another bulb 40 W - 220 V. Which bulb will give more illuminance ?

A hemisphere of radius R is placed in a uniform electric field E so that its axis is parallel to the field. Which of the following statement(s) is/ar...

In the circuit shown in the figure all the resistance are identical and each has the value r$$\Omega $$. The equivalent resistance of the combination ...

A non-zero current passes through the galvanometer G shown in the circuit when the key K is closed and its value does not change when the key is opene...