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Electromagnetic...

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  • Question 1
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    A flux of 1m Wb passes through a strip having an area A = 0.02 m2 . The plane of the strip is at an angle of 60 ºto the direction of a uniform field B. The value of B is

  • Question 2
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    The number of turns in a long solenoid is 500. The area of cross-section of solenoid is 2 ×10-3 m2 . If the value of magnetic induction, on passing a current of 2 amp, through it is 5 ×10-3 tesla, the magnitude of magnetic flux connected with it in webers will be

  • Question 3
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    A conducting loop of radius R is present in a uniform magnetic field B perpendicular the plane of the ring. If radius R varies as a function of time `t ', as R = R0 + t. The e.m.f induced in the loop is

  • Question 4
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    The instantaneous flux associated with a closed circuit of 10 Ωresistance is indicated by the following reaction f = 6t2 _ 5t + 1, then the value in amperes of the induced current at t = 0.25 sec will be

  • Question 5
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    When a magnet is being moved towards a coil, the induced emf does not depend upon

  • Question 6
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    An electron is moving in a circular orbit of radius R with an angular acceleration a. At the centre of the orbit is kept a conducting loop of radius r, (r <

  • Question 7
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    A field of 5 x 104 /p ampere-turns/metre acts at right angles to a coil of 50 turns of area 10-2 m2 . The coil is removed from the field in 0.1 second. Then the induced emf in the coil is

  • Question 8
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    square wire loop of 10.0 cm side lies at right angles to a uniform magnetic field of 20T. A 10 V light bulb is in a series with the loop as shown in the fig. The magnetic field is decreasing steadily to zero over a time interval Dt. The bulb will shine with full brightness if Dt is equal to

  • Question 9
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    The rate of change of magnetic flux denisty through a circular coil of area 10-2 m2 and number of turns 100 is 103 Wb/m2 /s. The value of induced e.m.f. will be

  • Question 10
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    A long solenoid contains 1000 turns/cm and an alternating current of peak value 1A is flowing in it. A search coil of area of cross-section 1 ×10-4 m2 and having 50 turns is placed inside the solenoid with its plane perpendicular to the axis of the solenoid. A peak voltage of 2p2 ×10-2 V is produced in the search coil. The frequency of current in the solenoid will be

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