JEE Mains · Physics · STD 12 -6. Electromagnetic induction
Three identical coils \(C _1, C _2\) and \(C _3\) are closely placed such that they share a common axis.\(C _2\) is exactly midway.\(C _1\) carries current I in anti-clockwise direction while \(C _3\) carries current I in clockwise direction. An induced current flows through \(C _2\), will be in clockwise direction when
- A \( C_{1} \) and \( C_{3} \) move with equal speeds away from \( C_{2} \)
- B \( C_{1} \) moves towards \( C_{2} \) and \( C_{3} \) moves away from \( C_{2} \)
- C \( C_{1} \) moves away from \( C_{2} \) and \( C_{3} \) moves towards \( C_{2} \)
- D \( C_{1} \) and \( C_{3} \) move with equal speeds towards \( C_{2} \)
Answer & Solution
Correct Answer
(B) \( C_{1} \) moves towards \( C_{2} \) and \( C_{3} \) moves away from \( C_{2} \)
Step-by-step Solution
Detailed explanation
Magnetic field through the coil is \( \vec{B}=(B_{C_{2}}-B_{C_{1}})\hat{i} \) \( \phi=(B_{C_{2}}-B_{C_{1}})A \) \( \epsilon=\frac{-d\phi}{dt} \) Find the direction according to Lenz's law. If coil move away then magnetic field decreases & vice versa Correct Ans. (2)
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