Question 85: Electromagnetic Induction

Question

A conducting bar of length L is free to slide on two parallel conducting rails as shown in the figure
Two resistors R
1
and R
2
are connected across the ends of the rails. There is a uniform magnetic field $\overrightarrow B $ pointing into the page. An external agent pulls the bar to the left at a constant speed v.
The correct statement about the directions of induced currents I
1
and I
2
flowing through R
1
and R
2
respectively is :
![](https://imagex.cdn.examgoal.net/1kmilq5ig/6a67b0da-5f2d-4712-8082-dde2a0f335e6/a959ce80-89f5-11eb-9c26-d9a423ffb060/file-1kmilq5ih.jpg)

Accepted Answer

When bar slides, area of loop 1 decreases and that of loop 2 increases. Magnetic flux decreases in 1 and increases in 2. Therefore induced emf and current resist this change. As a result B should increase in 1 and decrease in 2. So, I
1
should be clockwise and I
2
anticlockwise.
![](https://imagex.cdn.examgoal.net/1kp5iu1rn/65392048-5076-4640-8a20-d22f1f877e2b/d0009340-be28-11eb-81f3-c51a1255b226/file-1kp5iu1ro.jpg)

Answer

Both I
1
and I
2
are in clockwise direction

Answer

I
1
is in clockwise direction and I
2
is in anticlockwise direction

Answer

I
1
is in anticlockwise direction and I
2
is in clockwise direction

Answer

Both I
1
and I
2
are in anticlockwise direction

Electromagnetic Induction

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