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PHYSICS

JAMB 2015 - Question 6

Physics 2015 JAMB Past Questions - Question 6: A proton moving with a speed of 1.0 x 10ms~¹ through a magnetic field of 1.0 T experiences a magnetic force of magnitude 8.0 x 10¹¹ N. The angle between the proton's velocity and the field is

Choose the correct answers from the options given.

A proton moving with a speed of 1.0 x 10ms~¹ through a magnetic field of 1.0 T experiences a magnetic force of magnitude 8.0 x 10¹¹ N. The angle between the proton's velocity and the field is

A: 45°

B: 30°

C: 60°

D: 90°

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Correct Answer

Explanation

The force acting on moving charge in magnetic field is given by: F=q VBSin θ
sin θ =F=(8.0x10)-14/1.6x10-19x1.0x106x1.0 = (8.0x10)14/16 x 1013
(8.0x 10)-14/16x10-14
=0.5000
∴ θ = sin^-1 0.5000
= 30°