NEET2021Physics-Magnetic Force on Moving Charges
NEET 2021 Physics Force on Electron Near Conductor MCQ Question
Type: MCQ-numerical-Medium-Class 12
An infinitely long straight conductor carries a current of 5 Å as shown. An electron is moving with a speed of 10⁵ m/s parallel to the conductor. The perpendicular distance between the electron and the conductor is 20 cm at an instant. Calculate the magnitude of the force experienced by the electron at that instant.
A
4 × 10⁻²⁰ N
B
8π × 10⁻²⁰ N
C
4π × 10⁻²⁰ N
D
8 × 10⁻²⁰ N
Correct Answer
Option D
Detailed Explanation
The magnetic force on a moving charge is given by F = qvB, where B = μ₀I/(2πr). Substituting the values, we find the force to be 4π × 10⁻²⁰ N.
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