Electric lines of force

Asked by gunjansingh | 10th Jun, 2011, 04:54: PM

Expert Answer:

Force per unit charge e=q/R^2 due to a chrge q at a distance R.
No of lines of force per unit area normal to the surface.If there are N lines of force per unit charge then there are Nq lines of force.If we close this charge with a sphereical surface of radius R the the tptal no of lines crossing the surface are qN,Lines of force per unit area in normal direction is 
Nq/4 pi r^2 but this the field q/R^2.Both are equal so
Nq/4pi.R^2=q/R^2 ==> N=4pi.
But in the rational system the field=q/4pi.R^2.In this system N=1 i.e one line of force pre unit charge.

Answered by  | 13th Jun, 2011, 11:48: AM

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