1. A uniform electric field 380V/m is directed out of the page. A proton moves w

Question

1. A uniform electric field 380V/m is directed out of the page. A proton moves with a constant velocity from left to right at 35m/s. The proton experiences a magnetic force in addition to the electric force so the proton velocity stays constant. What is the direction of the magnetic field?

2. A uniform electric field 380V/m is directed out of the page. A proton moves with a constant velocity from left to right at 35m/s. The proton experiences a magnetic force that cancels the electric force so that the proton velocity stays constant. What is the magnitude of the required magnetic field? (answer in tesla units)

Explanation / Answer

1) E =380 V/m , v =35 m/s,

electric force = is out of page

Net force is zero

electirc force = - magnetic force

-qE = q(vxB)

-k = (ix-j)

magnetic filed is along downward direction

(b) E =vB

380 =35*B

B = 10.86 T

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