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In a uniform magnetic field B a wire in the form of a semicircle of radius r rotates obout the diameter of the circle with angular frequency `omega`. The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R, the mean pwer generated per period of rotation is

A

`(Bpir^(2)omega)/(2R)`

B

`((Bpi r^(2)omega)^(2))/(4R)`

C

`((Bpir^(2)omega)^(2))/(2R)`

D

`((Bpir^(2)omega)^(2))/(8R)`

Text Solution

Verified by Experts

The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-ELECTROMAGNETIC INDUCTION-Assignment (SECTION - A)
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  2. The variation of induced emf (epsilon ) with time (t) in a coil if a s...

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  3. In a uniform magnetic field B a wire in the form of a semicircle of ra...

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  4. A metal conductor of length 1 m rotates vertically about one of its en...

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  5. A copper disc of the radius 0.1 m is rotated about its centre with 20 ...

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  6. Two coils of self-inductance 2 mH and 8 mH are placed, so close togeth...

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  7. As a result of change in the magnetic flux linked to the closed loop s...

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  8. An inductor (L = 100 mH), a resistor (R = 100Omega) and a battery (E =...

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  9. The equivalent quantity of mass in electricity is

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  10. In the circuit shown in figure, power generated in

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  11. Dimensional formula of self-inductance is

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  12. A time varying magnetic flux passing through a coil is given by phi=xt...

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  13. A metallic ring is dropped down, keeping its plane perpendicular to a ...

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  14. Lights of a car become dim when the starter is operated. Why?

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  15. Coefficient of coupling between two coils of self-inductances L(1) and...

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  16. There is uniform magnetic field directed perpendicular and into the pl...

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  17. A square loop of wire with side length 10 cm is placed at angle of 45^...

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  18. Near a circular loop of conducing wires as shown, an electron moves al...

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  19. A uniformly wound solenoid coil of self inductance 1.8xx10^(-4)H and r...

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  20. The magnitude of the earth's magnetic field at a place is B(0) and an...

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