How does one explain increase in resistivity of a metal with increase in temperature ?
With increase in temperature, the relaxation time (average time between successive collisions) decreases and hence resistivity increases.
Alternatively, Resistivity, ρ = increases as τ decreases with increase in temperature.
Alternatively, Resistivity, ρ = increases as τ decreases with increase in temperature.
Calculate the current drawn from the battery by the network of resistors shown in the figure.
Why should electrostatic field be zero inside a conductor ?
A capacitor of 4 μF is connected as shown in the circuit Figure. The internal resistance of the battery is 0.5 Ω. The amount of charge on the capacitor plates will be :
A point charge +Q is placed in the vicinity of a conducting surface. Draw the electric field lines between the surface and the charge.
Two identical cells, each of emf E, having negligible internal resistance, are connected in parallel with each other across an external resistance R. What is the current through this resistance ?
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 ?
How does one explain increase in resistivity of a metal with increase in temperature ?
Why do the electric field lines never cross each other ?