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qUESTIONS

MCQs-PYQs-12th-jee

A wire of length 50 cm moves with a velocity of 300 m/min, perpendicular to a magnetic field. If the emf induced in the wire is 2 V, the magnitude of the field in tesla is

MCQs-PYQs-12th-jee

A straight conductor 0.1 m long moves in a uniform magnetic field 0.1 T. The velocity of the conductor is 15 m/s and is directed perpendicular to the field. The m.f. induced between the two ends of the conductor is

MCQs-PYQs-12th-jee

A conducting rod PQ of length L = 1.0 m is moving with a

MCQs-PYQs-12th-jee

The inductance of a solenoid 0.5 m long of cross-sectional area 20 cm2 and with 500 turns is

The resistance of a galvanometer coil is R. What is the shunt resistance required to convert it into an ammeter of range 4 times

If an ammeter is connected in parallel to a circuit, it is likely to be damaged due to excess

The current flowing in a coil of resistance 90 Ω is to be reduced by 90%. What value of resistance should be connected in parallel with it

In the circuit shown, the galvanometer G of resistance 602 is shunted by a resistance r = 0.022. The current through R is nearly 1 A. The value of resistance R is (in ohms) is nearly

A galvanometer, having a resistance of 50 Ω gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section 2.97× 10^-2 cm² that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire =5*10^-7Ωm)

The resistance of a wire is 20 ohm. It is so stretched that the length becomes three times, then the new resistance of the wire will be [2013]

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