Question on: JAMB Physics - 2024
Calculate the magnetic force on an electron in a magnetic field of flux density 10 T, with a velocity of 3 x 107 m/s at 60º to the magnetic field (e = 1.6 x 10-19 C)
A
4.8 x 10-11N
B
4.6 x 10-12N
C
4.16 x 10-11N
D
4.3 x 10-11N
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Correct Option: C
The magnetic force on a moving charge is given by the formula:
F = qvB sinθ
- F is the magnetic force
- q is the charge of the electron (1.6 x 10-19 C)
- v is the velocity of the electron (3 x 107 m/s)
- B is the magnetic flux density (10 T)
- θ is the angle between the velocity and the magnetic field (60°)
Calculate the force:
F = (1.6 x 10-19 C) * (3 x 107 m/s) * (10 T) * sin(60°)
F = 4.8 x 10-12 * 0.866 N
F ≈ 4.16 x 10-11 N
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