An electron at point A in the figure below has a speed v0 of 1.96 106 m/s . (a)

Question

An electron at point A in the figure below has a speed v0 of 1.96 106 m/s

. (a) Find the magnitude and direction of the magnetic field that will cause the electron to follow the semicircular path from A to B.

T

to the left

to the right

upward

downward

into the page

out of the page

(b) Find the time required for the electron to move from A to B. s

An electron at point A in the figure below has a speed v0 of 1.96 106 m/s (a) Find the magnitude and direction of the magnetic field that will cause the electron to follow the semicircular path from A to B. T to the left to the right upward downward into the page out of the page (b) Find the time required for the electron to move from A to B. s

Explanation / Answer

a)

magnitude

B = m*v/q*r

= 9.11*10^-31*1.96*10^6/1.6*10^-19*0.05 = 2.232 *10^-4 T

direction

Using the right hand rule, with the velocity and charge of theelectron, the B field

       MUST GO INTO THE PAGE

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