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Electromagnetic Induction · Question 37

AIPMT 2004MCQEasy📈 Topic in 0% papers+4−1
1

A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is

  1. 5 seconds
  2. 1/5 seconds
  3. 40 seconds
  4. 20 seconds

Answer

(1) 5 seconds

Solution

Time constant of an L–R circuit: = LR

= 408 = 5 s

Answer: (1)

AIPMT 2004

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2

The magnetic flux through a circuit of resistance R changes by an amount in a time t. Then the total quantity of electric charge Q that passes any point in the circuit during the time t is represented by

  1. Q = 1R t
  2. Q = R
  3. Q = t
  4. Q = R t
AIPMT 2004
3

For a coil having L = 2 mH, current flow through it is I = t2e-t then, the time at which emf becomes zero

  1. 2 sec
  2. 1 sec
  3. 4 sec
  4. 3 sec
AIPMT 2001

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