A current i passes through a wire of length l , radius of cross-section r and resistivity `rho` . The rate of heat generation is

A steady current I flows through a wire of radius r, length L and resistivity rho . The current produced heat in the wire. The rate of heat loss in a wire is proportional to its surface area. The steady temperature of the wire is independent of–

Consider a wire of length l , area of cross-section A and resistivity rho and resistance (1)/(5) Omega . Its length is increased by applying a force on I and its length increases by four times of its original length. Find the new resistance in ohms of the wire.

Consider a wire of length l, area of cross section A, and resistivity rho with resistance 10 Omega . Its length is increased by applying a force, and it becomes four times of its original value. Find the changed resistance of the wire.

Consider a wire of length l, area of cross section A, and resistivity rho with resistance 10 Omega . Its length is increased by applying a force, and it becomes four times of its original value. Find the changed resistance of the wire.

A current I flows through a cylindrical rod of uniform cross-section area A and resistivity rho . The electric flux through the shaded cross-section of the rod as shown in figure is

The electric potential difference across a wire is constant. If l, A and rho are respectively the length, area of cross-section and resistivity of the material of the wire, then the rate of heat proudction in the resistor is