Verified Solution • 2025–26 Session
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QJEEM21Ph30a1: JEE Main 2021 Physics - Class 12 JEEM21Ph30a1 Solution: A conducting bar of length L is free to slide on two parallel…
A conducting bar of length L is free to slide on two parallel conducting rails as shown in the figure
Two resistors R1 and R2 are connected across the ends of the rails. There is a uniform magnetic field 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 I1 and I2 flowing through R1 and R2 respectively is :
Two resistors R1 and R2 are connected across the ends of the rails. There is a uniform magnetic field 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 I1 and I2 flowing through R1 and R2 respectively is :
Multiple Choice Options
- A Both I1 and I2 are in clockwise direction
- B I1 is in clockwise direction and I2 is in anticlockwise direction
- C I1 is in anticlockwise direction and I2 is in clockwise direction
- D Both I1 and I2 are in anticlockwise direction
Step-by-Step Verified Solution
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, I1 should be clockwise and I2 anticlockwise.