electrostatic potential and capacitance

Question 1

potential is a _ qty

Answer 1

scalar

Question 2

potential due a point charge

Answer 2

KQ/R

Question 3

potential at axial.point of dipole

Answer 3

kp/r²-a²

Question 4

potential at equitorial point of a dipole

Answer 4

0

Question 5

potential due to uniformly charged thin sphere (outside)

Answer 5

kq/r (r=distance from centre)

Question 6

potential due to uniform charged thin spherical shell inside and at surface

Answer 6

kq/R (R is radius)

Question 7

relation between E, V and r

Answer 7

E=-dV/dr

Question 8

in direction of electric field, potential _

Answer 8

decreases

Question 9

potential energy in system of two charges is given by

Answer 9

Kq1q2/r

Question 10

potential energy in system of 3 charges is given by

Answer 10

K[q1q2/r12+q2q3/r23+q3q1/r31]

Question 11

potential energy of dipole in uniform E

Answer 11

-P.E

Question 12

what is electrostatic shielding

Answer 12

making any region free from E

Question 13

E decreases/increases due to dielectric

Answer 13

decreases by K times

Question 14

dielectric constant and electric susceptibility relation

Answer 14

K=1+X

Question 15

capacitance formula

Answer 15

Q/V

Question 16

Capacitance depends only on

Answer 16

size and shape of conductor, permittivity of surroundings, presence of another conductor

Question 17

parallel plate capacitor formula

Answer 17

EoA/d

Question 18

capacitance of parallel plate capacitor on adding dielectric

Answer 18

C=EoA/(d-t+t/K)
t= thickness of dielectric

Question 19

energy stored in capacitor

Answer 19

1/2CV²

Question 20

relation between Q and C for retribution of charges

Answer 20

Q1’/Q2’=C1/C2

Question 21

common potential formula

Answer 21

V=q1+q2/(c1+c2)

Question 22

out of Q, C, E, U, V
which are affected by K when battery is disconnected

Answer 22

V, E, U decrease by K times
C increases by K times

Question 23

out of Q, C, E, U, V
which are affected by K when battery is connected

Answer 23

Q, C, U increase by K times

Question 24

n drops of same size and potential join to form a single big drop
what is the potential of this drop?

Answer 24

V×(n^2/3)

Question 25

on inc separation between 2 charges , U-

Answer 25

inc or dec depending on the charges

Question 26

%Delta formula

Answer 26

(final-initial)×100/initial

Question 27

Relation between K, insulation and polarisation

Answer 27

K inc, insulation dec, polarisation tougher

Question 28

angle between equipotential surface and lines of force

Answer 28

90