Current Electri...

As the switch S is closed in the circuit shown in figure, current passing through it is

The reading of the ideal voltmeter in the adjoining diagram will be

If voltage across a bulb rated 220 Volt – 100 Watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

A ring is made of a wire having a resistance R₀ = 12 Ω. Find the points A and B as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub circuit between thesepoints is equal to 8/3 Ω

Which of the adjoining graphs represents ohmic resistance?

Variation of current passing through a conductor as the voltage applied across its ends is varied as shown in the adjoining diagram. If the resistance (R) is determined at the points A, B, C and D, we will find that

From the graph between current I and voltage V shown below, identify the portion corresponding to negative resistance

The resistance R₁ of a conductor varies with temperature t as shown in the figure. If the variation is represented by R_t = R₀ [1 + αt + βt²], then

A long straight wire of a circular cross-section (radius a) carries a steady current I and the current I is uniformly distributed across this cross-section. Which of the following plots represents the variation of magnitude of magnetic field B with distance r from the centre of the wire?