PHYS 192 Spring 2018 EXa Please answer all questions with 3 significant figures

Question

PHYS 192 Spring 2018 EXa Please answer all questions with 3 significant figures in the blanks provided. The electric potential on a large flat plate, which is located at y 0, is 0 V. The electric potential on a second large flat plate, which is located at y 7 cm is 130 V. A proton moves between the plates with constant velocity of 739 m/s in the +x direction.(Ignore gravity and air resistance.) What is the magnitude of the electric field between the plates? What is the direction of the electric field between the plates? _(circle one) +x -x+ N/C y -y + What is the magnitude of the magnetic field between the plates? What is the direction of the magnetic field between the plates? (circle one) xx If you were to turn off the electric field, then the proton would move in a circle. What would the radius of the circle be?

Explanation / Answer

E = V /d = (130 - 0) / (0.07)

E = 1857 N/C .....Ans

field is always from high potential to low potential.

+y .......Ans

Fnet = q E + q (v x B) = 0

v x B = - E

B = 2.51 T ..........Ans

v x B is along -y axis.

and v is along +x axis

so B -> +z ........Ans

Fb = mv^2 / r

q v B = m v^2 / r

r = m v / q B

= (1.67 x 10^-27) (739) / (1.6 x 10^-19 x 2.51)

= 3.07 x 10^-6 m ........Ans

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