KCET2014PhysicsCurrent Electricity
What is the electric potential at a distance of ( 9 ~cm ) from ( 3 nC ? )
Options
- A( 270 ~V )
- B( 3 ~V )
- C( 300 ~V )
- D( 30 ~V )
Correct answer
C. ( 300 ~V )
Step-by-step solution
Electric potential is given as [ V= 1 4 ₀ q r ] Given [ q=3 n C=3 10⁻⁹ C ; r=9 ~cm =9 10⁻² ~m ] Therefore, [ V= (9 10^ ) 3 10⁻⁹ 9 10⁻² =3 10² V ] Thus, electric potential at a distance of ( 9 ~cm ) from ( 3 nC ) is ( 300 ~V )