Question

A charged particle enters a uniform magnetic field perpendicular to its velocity. If the field is suddenly doubled, the radius of its path becomes:

• A. Half
• B. Double
• C. Four times
• D. Remains same

Hint:

Radius is inversely proportional to magnetic field strength.

Answer 1

The Correct Option is A

Radius of circular path, \[ r=\frac{mv}{qB} \] If \(B\) is doubled, \(r\) becomes half.