Electrostatic Potential & Capacitance

Question 1

Electric Potential

Answer 1

work done per unit charge in bringing a positive test charge from infinity to a specific point in an electric field.
potential(v)=w/q

Question 2

Potential due to single charge

Answer 2

V=KQ/R

Question 3

Potential due to multiple charges

Answer 3

V= kQ1/r1+KQ2/r2+KQ3/r3

Question 4

Electric Potential due to electric dipole

Answer 4

Vp=kpcos(theta)/r^2

Question 5

equipotential surface

Answer 5

a surface where all points have the same potential, or electric potential

Question 6

capacitance

Answer 6

C=q/V

Question 7

capacitance of parallel plate capacitor

Answer 7

C=ε0*A/d

Question 8

capacitor with dielectric

Answer 8

c=Cok (or) C=kε0*A/d
where
Co–>capacitance in vaccum
k–>dielectric constant

Question 9

capacitor in series

Answer 9

1/cs=1/c1+1/c2+1/c3

Question 10

capacitor in parallel

Answer 10

c=c1+c2+c3

Question 11

capacitor with dielectric of thckness t

Answer 11

C=ε0*a/[d-t+(t/k)]

Question 12

work done in arranging two charges in an external electric field

Answer 12

1)work done bringing q1 against electric field–>Q1V
2)work done bringing q2 against electric field–>Q2V
3) work done q2 against the force by q1 –> kq1q2/r

Question 13

potential energy of a dipole in a uniform electric field

Answer 13

U=pE cos(oi-of)

Question 14

energy loss in joining two capacitors

Answer 14

1/2* C1C2(V1-V2)^2 / C1+C2