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The earth's magnetic field at a given po...

The earth's magnetic field at a given point is `0.5xx10^(-5) Wb-m^(-2)`. This field is to be annulled by magnetic indcution at the centre of a circular conducting loop of radius `5.0 cm`. The current required to be flown in the loop is nearly

A

0.2 A

B

0.4 A

C

4A

D

40A

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The correct Answer is:
B
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AAKASH INSTITUTE-MOVING CHARGES AND MAGNETISM-Assignment (Section A) Objective Type Questions (One option is correct)
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  2. A current flows in a conductor from east to west. The direction of the...

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  3. The earth's magnetic field at a given point is 0.5xx10^(-5) Wb-m^(-2)....

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  4. A long straight wire carrying current of 30 A is placed in an exte...

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  5. Two similar coils are kept mutually perpendicular such that their cent...

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  6. The vector form of Biost-Savart law for a current carrying element is

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  7. Two long straight wires are set parallel to each other Each carries a ...

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  8. A long solenoid carrying a current produces a magnetic field B alon...

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  9. A long solenoid has 200 turns per cm and carries a current of 2.5 amps...

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  10. If a long hollow copper pipe carriers a direct current, the magnetic f...

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  11. In a current carrying long solenoid, the field produced does not depen...

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  12. A long solenoid has 800 turns per metre length of solenoid A current o...

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  13. A solenoid 1.5 metre and 4.0 cm in diameter possesses 10 turns/cm. A c...

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  14. A current of (1)/(4pi) A is flowing through a toroid. It has 1000 numb...

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  15. Mean radius of a toroid is 10 cm and number of turns is 500. If curren...

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  16. A long thin hollow metallic cylinder of radius 'R' has a current i amp...

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  17. A proton an an alpha-particle, moving with the same velocity, enter a ...

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  18. A particle of mass M and charge Q moving with velocity vec(v) describe...

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  19. An electron is travelling along the x-direction. It encounters a m...

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  20. Two ions having masses in the ratio 1 : 1 and charges 1 : 2 are projec...

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