Question

The figure shows that the circular paths of two particles that travel at the same speed in a uniform magnetic field B, which is directed into the page. One particle is a proton, the other is an electron.

• A. The electron follows bigger circle.
• B. The electron follows the smaller circle.
• C. Both the circles follow by electron only.
• D. Information not sufficient.

Answer 1

Answer: (B)

The electron follows the smaller circle.

As we know,
$F=q(v\times B)$
As mass is smaller for electron so electron follows smaller circle.