Suppose that you were looking down the barrel of a proton gun, as shown in the d

Question

Suppose that you were looking down the barrel of a proton gun, as shown in the diagram below.

As the proton (in the center of the diagram) moves toward you with constant velocity, v, it creates a B-field according to the right-hand rule. Consider how the B-field would change if the gun instead shot an electron with the same v.

What would happen to the strength of B?

a) The magnetic field strength would weaken.

b) The magnetic field strength would remain the same.    

c) The magnetic field strength would strengthen.

In what direction would the new B field point?

a) to the right

b) counter-clockwise    

c) into the screen

d) clockwise

e) straight down

f) straight up

g) out of the screen

h) to the left

Explanation / Answer

1.

b) The magnetic field strength would remain the same.

2.d) clockwise

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