Maximum power is delivered by battery to a load resistance R when

$$\epsilon_o$$ (permittivity of free space) and K is coulomb constant then $$\epsilon_o$$ is expressed as

The magnitude of electric field strength E such that an electron placed in it would

experience an electrical force equal to its weight is given by

The least resistance that one can have from six resistors of each 0.1 ohm resistance is

When three identical resistances are connected to form a triangle the resultant resistance between any two corners is 30Ω .The value of each resistance is

The capacity of a storage cell is 5 ampere hours. The maximum current it can supply for ten hours is

On moving a charge of 20 C by 2 cm, 2 J of work is done, then the potential difference between the points is

Two equal and opposite 5C charges are separated by a distance 10 cm. The electric potential at the midway between them is

In comparison with the electrostatic force between two electrons, the electrostatic force between two protons at the same distance is.

A battery of emf E and negligible internal resistance is connected to two resistors of resistances R₁ and R₂ as shown in the circuit diagram.

What is the potential difference across the resistor of resistance R₂?

When a potential difference V is applied across a conductor at a temperature T, the drift velocity of electrons is proportional to

How much K.E will be gained by an electron in going from 20 V to 40 V

Two charges are placed at a certain distance apart in air. When a metallic sheet is placed between them, the electrostatic force between them will.

Two charges each equal to 2μC are 0.5m apart. If both of them exist inside vacuum, then the force between them is

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the center of the sphere is

Area under Q –V graph for a capacitor represents

Three charge each of +q are placed at the three corners of an equilateral triangle. If force between any two charges is F, then resultant force on a charge is

The electric field due to a charge at a distance of 3 m from it is 500 N/coulomb. The magnitude of the charge is

A 100W, 200V bulb is connected to a 160V supply. The actual power consumption would be

If we double the voltage then according to C= Q/V the capacitance will become

If a unit charge is taken from one point to another point over an equipotential surface, then___________

A capacitor is a perfect insulator for

At what temperature will the resistance of a copper wire become three times its value at 0^oC (Temperature coefficient of resistance for copper = 4 × 10^–3 per ^oC.

A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volts are to be used from a

household supply. The rating of fuse to be used is

If the temperature is increased by 3°C, the value of temperature co-efficient of

resistivity.

The dielectric constant k of an insulator cannot be

The electric field at a distance 3R/2 from the center of a charged conducting spherical shell of radius R is E. The electric field at a distance R/2 from the centre of the sphere is.

A capacitor of capacitance C has charge Q and stored energy is E. If the charge is

increase to 2Q. The stored energy will

A wire of resistance of 10 $$\Omega$$  is stretched and its length becomes twice. Its resistance becomes

Two bulbs of 500 W and 300 W are manufactured to operate on a 220V line. If their resistances are R₁ and R₂ respectively, the value of R₁/R₂ is,

The frequency of direct current is:

An electric iron is marked 20 volts 500W. The units consumed by it in using it for 24

hours will be

How much potential difference is required for establishing steady current?

What is the voltage across the 2F capacitor?

Gradient of I –V graph for a conductor represents

What carries current in an electrolyte?

In a region of constant potential

Uniform electric field exist

A parallel plate capacitor is charged by connecting to a battery. The battery is removed, and glass slab is introduced between the plates. Then,