Question

A pendulum whose mass is a 2g sphere hangs from a wire inside two electrically charged plates with equal charge of opposite sign (creating a uniform field E ) The separation of the plates is 10 cm. It determines the difference of potential between the plates knowing that the wire forms an angle of 10o with the vertical and that the charge of the sphere is 10nc (10 x 10-9c.

A.	3.5 x104 v
	B.	35 x 108 v
	C.	0.35 v
	D.	350v
	E.	35 v

Answer 1