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Question: Answered & Verified by Expert
In a transformer, number of turns in the primary coil are 140 and that in the secondary coil are 280. If current in primary coil is $4 \mathrm{~A}$, then that in the secondary coil is
PhysicsAlternating CurrentJEE MainJEE Main 2002
Options:
  • A
    4 A
  • B
    2 A
  • C
    6 A
  • D
    10 A
Solution:
2510 Upvotes Verified Answer
The correct answer is:
2 A
$I_1 N_1=I_2 N_2 \Rightarrow I_2=\frac{4 \times 140}{280}=2 \mathrm{~A}$

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