If a constant potential difference is applied across a bulb, the current slightly decreases as time passes and then becomes constant. Explain.

If the potential difference V applied across a conductor increases to 2V, drift velocity of the electron be

Ametallic block has no potential difference applied across it, then mean velocity of free electrons is

A potentiometre wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction.The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in two cases. The ration of emf's is

A potential difference of 3V is applied across a conductor through which 5A of current is flowing. Determine the resistance of the conductor.

A discharge tube contains helium at a low pressure. A large potential difference is applied across the tube. Consider a helium atom that has just been ionized due to the detachment of an atomic electron. Find the ratio of the distance travelled by the free electron to that by the positive ion in a short time dt after the ionization.

Across a metallic conductor of non-uniform cross-section a constant potential difference is applied Which one of the following statements is correct? Along the conductor,

Explain the effect of potential difference on photoelectric current.

A potential difference across 24Omega resistor is 12 V. What is the current through the resistor?