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Topic Question Set

Q 11 :

Three identical coils C1, C2 and C3 are closely placed such that they share a common axis. C2 is exactly midway. C1 carries current I in anti-clockwise direction while C3 carries current I in clockwise direction. An induced current flows through C2 will be in clockwise direction when            [2026]

  • C1 moves towards C2 and C3 moves away from C2

     

  • C1 moves away from C2 and C3 moves towards C2

     

  • C1 and C3 move with equal speeds towards C2

     

  • C1 and C3 move with equal speeds away from C2

     

(1)

Magnetic field through the coil is

B→=(Bc2-Bc1) i^

ϕ=(Bc2-Bc1)A

ε=-dϕdt

Find the direction according to Lenz's law.

If the coil moves away, then the magnetic field decreases and vice versa.

Correct Ans. (1)