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A charge Q is uniformly distributed over the surgace of non conducting disc of radius R. The disc rotates about an axis perpendicular to its plane and passing through its centre with an angular velocity `omega`. As a result of this rotation a magnetic field of induction B is obtained at the centre of the disc. If we keep both the amount of charge placed on the disc and its angular velocity to be constant and vary the radius of the disc then the variation of the magnetic induction at the centre of the disc will be represented by the figure

A

B

C

D

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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-III
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  5. A straight wire is first bent into a circle of radius 'r' and then int...

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  9. A long straight wire of radius a carries a steady current is uniformly...

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  10. The total magnetic induction at point O due to curved portion and stra...

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  11. An infifnitely long conductor PQR is bent to form a right angle as sho...

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  12. A straight conductor of length 32 cm carries a current of 30A. Magneti...

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  13. Two parallel long wires carry currents 18A and 3A. When the currents a...

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  14. A long straight wire along the Z-axis carries a current I in the negat...

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  15. A wire carrying a current i is first bent in the form of a square of s...

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  16. Two long mutually perpendicular conductors carrying currents I1 and I2...

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  17. Two wires of same length are shaped into a square and a circle. If the...

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  18. Current 'i' is flowing in heaxagonal coil of side a. The magnetic indu...

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  19. A solenoid of length 'l' has N turns of wire closely spaced, each turn...

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  20. A toroid has a core (non-ferromagnetic) of inner radius 25 cm and oute...

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