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.
State which of the two a capacitor or an inductor, tends to become SHORT when the frequency of the applied alternating voltage has a high value.
Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them. Which wire gets heated up more ? Justify your answer.
Graph showing the variation of current versus voltage for a material GaAs is shown in the figure, identify the region of :
For any charge configuration, equipotential surface through a point is normal to the electric field. Justify.
Plot a graph showing the variation of current I versus resistance R, connected to a cell of emf E and internal resistance r.
A device ‘X’ is connected to an ac source V = V₀ sin(ωt). The variation of voltage, current and power in one complete cycle is shown in the following figure.
(i) Which curve shows power consumption over a full cycle?
(ii) Identify the device ‘X’.