formulae

Question 1

electric field at axial part of the ring

Answer 1

E(axial)=kQx/(r^2+x^2)^3/2

Question 2

field at centre of the ring

Answer 2

at centre of ring x=0 ,therefore field=0

Question 3

field at large distance from ring

Answer 3

0

Question 4

point in ring where field is maximum and formula

Answer 4

field is maximum at x=r/root2 , E=2kq/3root3 r^2

Question 5

time period of a charged particle performing SHM

Answer 5

T=2pi(mr^3/kqQ)^1/2

Question 6

Electric field on a circular arc

Answer 6

E=2kλsin(theta/2)/r where lambda is surface charge density and theta is angle subtended by arc at centre

Question 7

electric field lines in an infinite length rod/wire….

Answer 7

cylindrically radial

Question 8

electric field in an infinite length rod/wire

Answer 8

e=2kλ/r

Question 9

field for semi infinite rod

Answer 9

e=(2)^1/2kλ/r

Question 10

field axis on rod formula

Answer 10

e=kλ[1/paas ka corner-1/dur ka corner]