The dome of a van de graaff generator has a diameter of 30 cm and is at a potential of +20 000v. calculate : a) the charge on the dome b) the electric field strength at the surface of the dome c) the force on a proton near the surface of the dome

a) radius of the dome r=15 cm

Potential, V=20,000 V

here Q is charge, is permitivity of vacuum and r is the distance from the charge.

b) Electric field (E) strength at the surface of the dome is given by:

c)force on the proton near the surface of the dome:

where E is the electric field and q is the charge of proton.

charge of a proton

b

explanation:

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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