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Question
The current in the primary coil of a pair of coils changes from 7 A to 3 A in 0.4 s. The mutual inductance between the two coils is 0.5. The induced emf in the secondary coil is ______.
Options
50 V
75 V
100 V
220 V
MCQ
Fill in the Blanks
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Solution
The current in the primary coil of a pair of coils changes from 7 A to 3 A in 0.4 s. The mutual inductance between the two coils is 0.5. The induced emf in the secondary coil is 50 V.
Explanation:
Induced emf = |ε|
= `M (di)/dt`
= 0.5 × (4/0.04)
= 50 V
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