Suppose that in question 3, the magnitude of the electric field inside the capac

Question

Suppose that in question 3, the magnitude of the electric field inside the capacitor is 200 N/C and the particle is moving at 2,000 m/s. What is the magnitude of the magnetic field needed to keep the charge going straight? Input your answer in T and put in the number only. (No, you do not need the charge of the particle in order to answer this question)

A positive particle moves upwards towards a capacitor as shown below. In what direction should a magnetic field be set up inside the capacitor in order for the particle to move through the capacitor undeflected? (Ignore the effects of gravity) O Up Down O Left Right Into the page Out of the page The electron does not feel a force

Explanation / Answer

for the charge to go straight Fnet = 0

Fb+ Fe = 0

Fb = magnetic force = q*v*B

Fe = electric force = -Eq

E = electric field

v = speed of the particle

q*v*B - E*q = 0

v*B = E

magnetic field B = E/v = 200/2000 = 0.1 T <<<--------ANSWER

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