Physics-
General
Easy
Question
A simple pendulum with bob of mass m and conducting wire of length L swings under gravity through an angle . The earth’s magnetic field component in the direction perpendicular to swing is B. Maximum potential difference induced across the pendulum is
The correct answer is:
Þ (i)
Maximum velocity at equilibrium is given by
\
Þ
Thus, max. potential difference
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The network shown in the figure is a part of a complete circuit. If at a certain instant the current i is 5 A and is decreasing at the rate of then is
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The figure shows three circuits with identical batteries, inductors, and resistors. Rank the circuits according to the current through the battery (i) just after the switch is closed and (ii) a long time later, greatest first
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Maths-General
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A conducting rod AC of length 4l is rotated about a point O in a uniform magnetic field directed into the paper. AO = l and OC = 3l. Then
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A wire cd of length l and mass m is sliding without friction on conducting rails ax and by as shown. The vertical rails are connected to each other with a resistance R between a and b. A uniform magnetic field B is applied perpendicular to the plane abcd such that cd moves with a constant velocity of
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A rectangular loop with a sliding connector of length l = 1.0 m is situated in a uniform magnetic field B = 2T perpendicular to the plane of loop. Resistance of connector is r = 2. Two resistance of 6 and 3 are connected as shown in figure. The external force required to keep the connector moving with a constant velocity v = 2m/s is
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Plane figures made of thin wires of resistance R = 50 milli ohm/metre are located in a uniform magnetic field perpendicular into the plane of the figures and which decrease at the rate dB/dt = 0.1 m T/s. Then currents in the inner and outer boundary are. (The inner radius a = 10 cm and outer radius b = 20 cm)
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