Question

calculate the electric potential at a point 0.3 m from the center of the charged sphere of charge 15 mu when it is placed in air and in a medium of dielectric constant 5​

Answer 1

Answer:

Solution

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Correct option is

C

9×10

−3

J

Step 1: Formula of Potential energy

Electrostatic potential energy is given by U between two charges placed at a separtion r is given by

⇒ U=

r

kq

1

q

2

Step 2: Calculations

Putting values, k=9×10

9

C

2

N.m

2

,

q

2

=q

1

=1μC=1×10

−6

C,

r=1m

⇒U

=

1

9×10

9

×1×10

−6

×1×10

−6

=9×10

−3

J

Hence, correct option is C.