a. An electron moving clockwise produces a magnetic field ____ (out?) b. A proto

Question

a. An electron moving clockwise produces a magnetic field ____ (out?)

b. A proton moving counterclockwise produces a magnetic field ____ (out?)

c. A wire with a current to the north produces a magnetic field to the ____ below the wire

d. A wire with a current to the west produces a magnetic field to the ____ above the wire.

e. If a proton moves to the east in a magnetic field into the page, the direction of the electric field that would produce an electric force to cancel the magnetic force is to the ____

f. To produce a B field out of the page, a solenoid needs to have a ___ current

Thanks! And which two hand rules are we using. There's one where the thumb points in direction of B, and the fingers curl for current. That's what I know for the first two...?

Explanation / Answer

a)elec. moves clockwise so current anticlockwise

So mag. field is out

b)mag. field is out

So you understand a and b right.

c)For wire carrying current, keep thumb of right along current. The direction of curling fingers will give the direction of mag. field

so when current in north then, on below of wire, mag.field is towards left.

d)when current is west then, mag. field in north above the wire

e)F=qvxB

So for v towards right and B into the plane , F will be up

So

E must be downwards to counter the F

f)counter clockwise

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