What is the electric potential 15 cm above the center of a uniform charge density disk of total charge 10 nC and radius 20 cm? a) 360 V
b) 450 V
c) 22.5 V
d) 0 V

b) 450 V

Explanation:

We are given that

Total charge, q=10nC=

Radius, r=20 cm=

1 m=100 cm

x=15 cm=0.15 cm

We have to find the electrical potential 15 cm above  the center of a uniform charge density disk .

We know that

Where

Electric potential,

Where

Using the formula

Hence, option b is correct.

The potential is given by 449.7 V.

Explanation:

radius of disc, R = 20 cm = 0.2 m

distance, x = 15 cm = 0.15 m

charge, q = 10 nC

surface charge density

The electric potential is given by

c) up

hope this