Find the direction of the force on a n e g a t i v e charge for diagram (a)~(d)

Question

Find the direction of the force on a negative charge for diagram (a)~(d) and (f) shown in the figure. v? (green) is the velocity of the charge and B? (blue) is the direction of the magnetic field. (? means the vector points into the page. ? means it points out of page) (Figure 1)

Part A

diagram (a)

Part B

diagram (b)

Part C

diagram (c)

Part D

diagram (d)

Part E

diagram(f) (Notice!! not diagram(e)!!)

Find the direction of the force on a negative charge for diagram (a)~(d) and (f) shown in the figure. v? (green) is the velocity of the charge and B? (blue) is the direction of the magnetic field. (? means the vector points into the page. ? means it points out of page) (Figure 1) Part A diagram (a) Part B diagram (b) Part C diagram (c) Part D diagram (d) Part E diagram(f) (Notice!! not diagram(e)!!)

Explanation / Answer

use right-hand rule (fingers in direction of v, curl them towardsB, thumb points in F) and then change the direction of F toopposite what you get (alternatively, use your left hand)

(a)   left
(b)   left
(c)   up
(d)   into page
(e)   zero
(f)   down

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