A small ball of mass m = 4 kg and charge q = -1C bangs from the upper plate of a

Question

A small ball of mass m = 4 kg and charge q = -1C bangs from the upper plate of a parallel plate capacitor that is connected to a 12 volt battery. Do pot Draw field lines on the diagram above to represent the electric field due to the plates in the region between the plates (Neglect fringing effects) Find the electric field (magnitude and direction) due to the plates at the location of the ball. Show your work. Find the electric force (magnitude and direction) acting on the ball. Show your work. Find the tension in the thread show your work. suppose that the distance d between the plates is now increased (but the plates are still connected through the battery) Does the magnitude of the electric field due to the plates increase, decrease, or remain the same? Explain your reasoning. Does the tension in the thread increase, decrease, or remain the same? Explain.

Explanation / Answer

part B :

Electric field E = V/d

E = 12/0.03

E = 400 Volts

this is directed in upward Direction

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part C:

Electric force F = E q

F 400 * 1C

F = - 400 N

Directed in Downward direction

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part D:

Tension T = ma

use for a,

ma = E q

ma = Eq -400 N

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E. Electric field is inversly proportioanl to distance

so

if d increases, E decrases

ii) Tension remains same

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