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qUESTIONS

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]

A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively [2008]

A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire [2017]

When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become [2002]

When a wire of uniform cross-section a, length I and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be [2005]

MCQs-PYQs-12th-jee

The equivalent inductance of two inductances is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is

MCQs-PYQs-12th-jee

An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57 x 10^-2 T. If the value of e/m is 1.76 x 10^11 C kg-1, the frequency of revolution of the electron is

MCQs-PYQs-12th-jee

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is?

MCQs-PYQs-12th-jee

A square loop ABCD, carrying a current i, is placed near and coplanar with a long straight conductor XY carrying a current I, the net force on the loop will be

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