Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

A current is passed through two coils connected in series. The potential difference across the first coil is 3V and that of the second coil 4.5V. If the first coil has resistance of 2Omega , the resistance of the second coil is

If the length of a wire conductor is doubled by strctching it while keeping the potential difference constant, by what factor will the drift speed of the electrons change?

According to Joule's law, if the potential difference across a conductor having a material of specific resistance p remains constant, then the heat produced in the conductor is directly proportional

A potentiometer 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 the two cases. The ratio of emf's is :