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The magnetic flux linked with a coil var...

The magnetic flux linked with a coil varies with time t as `phi=at^(2)+bt+c`, where a, b and c are constants. The emf induced in the coil will be zero at a time of

A

`(b)/(a)`

B

`-(b)/(a)`

C

`(b)/(2a)`

D

`-(b)/(2a)`

Text Solution

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The correct Answer is:
D
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CHHAYA PUBLICATION-ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT-EXERCISE
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  2. The magnetic flux across a coil, of 50 turns and of diameter 0.1 m, ch...

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  3. A coil with a small area of 10^(-5)m^(2) is lying on the xy -plane aro...

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  4. The magnetic flux linked with a coil varies with time t as phi=at^(2)+...

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  5. Induced current in a coil due to electromagnetic induction does not de...

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  9. Two identical circular loops of metal wire are lying on a table withou...

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  10. A circular disc of radius 0.2 m is placed in a uniform magnetic field ...

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  11. A square wire loop of side 10 cm is placed at an angle of 45^(@) with ...

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  12. A rod of length b moves with a constant velocity v in the magnetic fie...

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  16. The self inductances of two coils are 16 mH and 25 mH, and they have a...

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  17. If current I passes through a pure inductor of self-inductance L, the ...

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  19. The current I in a coil varies with time as shown in the fig. The vari...

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