Recent questions tagged #mcq

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A circular coil of mean radius of 7 cm and having 4000 turns is rotated at the rate of 1800 rev/min in the earth’s magnetic field `(B = 0.5 G)`, the maximum emf induced in coil will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Eddy currents are produced,

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In induction furnace, heat is produced due

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Which of the following is not an application of eddy

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Amongst the following physical parameter, which is equivalent to

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The self-inductance of a coil having 500 turns is `50 mH`. The magnetic flux through the cross-sectional area of the coil while current through it is 8 mA, is found to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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If emf induced in a coil is `2V` by changing the current in it from `8A` to `6A` in `2 xx 10^(-3) s`, then the coefficient of self-induction

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A long solenoid has 1000 turns. When a current of `4 A` flows through it, the magnetic flux linked with each turn of the solenoid is `4 xx 10^(-3)Wb`. The self-inductance of the solenoid

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A coil and a bulb are connected in series with a DC source, a soft iron core is inserted in the coil, then the intensity of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The magnetic potential energy stored in a certain inductor is `25 mJ`, when the current in the inductor is `60 mA`. This inductor is of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The mutual inductance `M_(12)` of coil 1 with respect to coil

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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There are two long co-axial solenoids of same length `l`. The inner & outer coils have radii `r_1 & r_2` and number of turns per unit length `n_1 & n_2`, respectively. The ratio of mutual inductance to the self-inductance of the inner coil

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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When the magnetic flux linked with a conducting wire loop changes with time, an ................is induced in the

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In electromagnetic induction, the induced charge in a coil is independent

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If the resistance of a conductor is infinite. The power required to move a conductor in a uniform magnetic field is

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The core of a transformer is laminated to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The self-inductance of a coil is L. Keeping the length and area same, the number of turns in the coil is increased to four times. The self-inductance of the coil will be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Which of the following statement(s) is/are

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Which of the following statement(s) is/are

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A square loop is symmetrically placed between two infinitely long current carrying wires in the same direction. Magnitude of currents in both the wires are same. Now, match the Column I with Column II and select the correct answer from the codes given below Column I Column II A. Loop is moved p. Induced current towards right in the loop is clockwise. B. Loop is moved q. Induced current towards left in the loop is anti-clockwise. C. Wire-1 is r. Power in the moved towards loop is zero. left

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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