4. Find the direction of the magnetic force exerted on the particle in each of t

Question

4. Find the direction of the magnetic force exerted on the particle in each of the following cases (If the force is zero, just report your answer as zero!) (a) on a neutron moving toward south, by a magnetic field directed east. (b) on a proton moving toward east, by a magnetic field directed south. (c) on an electron moving toward east, by a magnetic field directed north. (d) on a proton moving toward north, by a vertically downward magnetic field. (e) on an electron moving toward west, by a magnetic field directed south. fon a proton moving toward south, by a vertically upward magnetic field. (g) on a proton moving vertically upward, by a magnetic field directed vertically downward. (h) on an electron moving toward east, by a magnetic field directed vertically upward. (i) on a proton moving toward 40 degrees west of north, by a vertically downward magnetic field.

Explanation / Answer

We know that

F = q v B sin(theta)

force is perpendicular to both B field and velocity

a)Zero

since neutron has no charge on it

b)Out of the page

c)Out of the page

For negative charge, direction is just apposite to that for a positive charge

d)zero

since theta = 180 deg ; sin180 = 0

e)Into the page

f)zero

g)zero

h)Into the page

i)East

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