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qUESTIONS

MCQs-PYQs-12th-jee

A long straight wire of radius a carries a steady current I. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B’ , at radial distances a/2 and 2a respectively from the axis of the wire is:

MCQs-PYQs-12th-jee

In the circuit of adjoining figure the current through 12 Ω register will be

Twelve wires of equal length and same cross-section are connected in the form of a cube. If the resistance of each of the wires is R, then the effective resistance between the two diagonal ends would be

In the circuit shown below E1 = 4.0 V, R₁= 2 Ω, E2 = 6.0 V, R2 = 4 Ω and R3 = 2 Ω. The current I1 is

In the circuit element given here, if the potential at point B, VB = 0, then the potentials of A and D are given as

If three bulbs 60 W, 100 W and 200 W are connected in parallel, then

In the circuit shown below, the power developed in the 6Ω resistor is 6 watt. The power in watts developed in the 4Ω resistor is

If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be

An electric bulb rated 220 V, 100 W is connected in series with another bulb rated 220 V, 60 W. If the voltage across the combination is 220 V, the power consumed by the 100 W bulb will be about

Ten identical cells connected in series are needed to heat a wire of length one meter and radius ‘r’ by 10° C in time ‘t’. How many cells will be required to heat the wire of length two meter of the same radius by the same temperature in time ‘t’

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