How does one explain increase in resistivity of a metal with increase in temperature ?
Calculate the current drawn from the battery by the network of resistors shown in the figure.
An electron is accelerated through a potential difference V. Write the expression for its final speed, if it was initially at rest.
Why do the electric field lines never cross each other ?
Why do the electrostatic field lines not form closed loops ?
Define the term mobility of charge carriers in a conductor. Write its S.I. unit.
When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction ?
Why must electrostatic field at the surface of a charged conductor be normal to the surface at every point ? Give reason.
The emf of a cell is always greater than its terminal voltage. Why ? Give reason.