A total charge of 7 × 10 –8 C isuniformly distributed throughout a non-conductin

Question

A total charge of 7 × 10–8 C isuniformly distributed throughout a non-conducting sphere with aradius of 5 cm. The electric potential at the surface, relative tothe potential far away, is about:

A)

–1.3 × 104 V

B)

1.3 × 104 V

C)

7.0 × 105 V

D)

–6.3 × 104 V

E)

0

A total charge of 7 × 10–8 C isuniformly distributed throughout a non-conducting sphere with aradius of 5 cm. The electric potential at the surface, relative tothe potential far away, is about:

A)

–1.3 × 104 V

B)

1.3 × 104 V

C)

7.0 × 105 V

D)

–6.3 × 104 V

E)

0

Explanation / Answer

Given charge on the sphere     q =7*10 -8 C radius of the sphere   r = 5 cm = 0.05m          Electric potentialat the surface                     V = k q / r                         = 9*109 N m2 / C2   *7*10-8 / 0.05                         = 1.26 *104   V    ˜ 1.3 * 104 V Answer :    ' B'

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