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A coil of self inductance 2.5 H and resi...

A coil of self inductance 2.5 H and resistance `20 Omega` is connected to a battery of emf 120 V having internal resistance of `5 Omega`. Find :
The time constant of the circuit

A

0.2 sec, 10A

B

2 sec, 10A

C

3 sec, 20A

D

4 sec, 20A

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-ELECTROMAGNETIC INDUCTION-EXERCISE-II
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  8. Calculate the equivalent resistance between the points A and B in Fig.

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  9. If a change in current of 0.01 A in one coil produces a change in ma...

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  10. The current in a coil is changed from 5A to 10A in 10^(-2)s. Then, an ...

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  11. Two coaxial solenods are made by winding thin insulated wire over a pi...

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  12. To emf induced in a secondary coil is 20000 V , when the current bre...

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

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  15. A 50 mh coil carries a current of 2 A. the energy stored in joules is

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  16. A condenser of capacity 1 mu F and a resistance 0.5 mega-ohm are conne...

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  17. An ideal coil of 10 H is joined in series with a resistance of 5Omega ...

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  18. A capacitor is connected to a 12 V battery through a resistance of (10...

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  19. A coil of self inductance 2.5 H and resistance 20 Omega is connected t...

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  20. A 8 mu F capacitor is charged by a 400 V supply through 0.1 M Omega re...

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