First slide

Magnetic flux and induced emf

Question

One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant sped v then the emf induced in the circuit in terms of B, l and v where l is the width of each tube, will be

Moderate

A

Zero
B

$2 B l v$
C

$B l v$
D

$- B l v$

Solution

Two emf's induces in the closed circuit each of value $B l v$ . These two emf's are additive. So $E_{net} = 2 B l v$ .

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