For a given charged particle

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism

Problem

For a given charged particle, the initial magnetic force is

F_{1}

when it moves with speed

v

in a field

B

making an angle of

30^{\circ}

with the field. The speed is then increased by

20\%

, the magnetic field is reduced by

10\%

, and the angle is changed to

45^{\circ}

. What is the approximate percentage change in the magnitude of the magnetic force? (a) About

24\%

decrease (b) About

53\%

increase (c) About

20\%

increase (d) About

15\%

increase