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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 ENGLISH-ELECTROMAGNETIC INDUCTION-ASSIGNMENT(SECTION - A) (OBJECTIVE TYPE QUESTIONS)
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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 magnet 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 induc...

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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. The magnetic flux through a coil varies with timet as shown in the dia...

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  9. A coil having 500 square loops each of side 10 cm is plance normal to ...

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

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  11. A short bar magnet passes at a steady speed right through a'long solen...

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

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  13. A bar magnet is made to fall through a long vertica! copper tube. The ...

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

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  15. A loop of irregular shape of conducting wire PORS (as shown in figure)...

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  16. When a conducting wire XY is moved towards the right, a current flows ...

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

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

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

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  20. Eddy current are produce when

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