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The magnetic flux phi (in weber ) in a c...

The magnetic flux `phi` (in weber ) in a closed circuit of resistance 10`Omega` varies with time t (in secnod) according to equation `phi=6t^(2)-5t+1`. The magnitude of induced current at `t=0.25` s is

A

1.2A

B

0.2A

C

0.6A

D

0.8A

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The correct Answer is:
B
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AAKASH INSTITUTE-ELECTROMAGNETIC INDUCTION-ASSIGNMENT(SECTION - A) (OBJECTIVE TYPE QUESTIONS)
  1. An emf can be induced in stationary coil if it is kept in

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  2. The induced e.m.f. in a coil does not depend on

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  3. The magnetic flux phi (in weber ) in a closed circuit of resistance 10...

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  4. A cylindrical bar amgnet is kept along the axis of a circular coil. If...

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  5. A magnet is brought towards a coil (i) speedly (ii) slowly then the in...

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  6. A circular loop of flexible conducting material is kept in a magnetic ...

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  7. An aeroplane is flying horizontally with a velocity of 360Km/hr. The d...

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  8. A coil having 500 square loops each of side 10 cm is placed normal to ...

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  9. The physical quantity, which is conserved on the basis of Lenz's Law i...

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  10. A metallic ring with a small cut is held horizontally and a magnet is ...

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  11. A loop of Irregular shape made of flexible conducting wire carrying cl...

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  12. A copper rod of length l is rotated about one end perpendicular to the...

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  13. A coil of cross-sectional area A having n turns is placed in uniform m...

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  14. A flat coil of 500 turns each of area 50 cm^(2) rotates in a uniform m...

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  15. Eddy currents are produced when

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  16. A motor starter

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  17. A simple electric motor has an armature resistance of 1Omega and runs ...

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  18. Which of the following is possible application of an RC circuit?

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  19. The current passing through a choke coil of self inductance 5 H is dec...

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  20. When the number of turns in a coil is doubled without any change in th...

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