Assertion : Light year and year, both measure time.
Reason : Because light year is the time light takes to reach the earth from the sun.

Answer

(A) r, (B) r, (C) p

Explanation

Electric field due to metallic plates remains same and constant at near by points.
[A] For `sigma_(1)+sigma_(2)=0 rArr sigma_(0)=-sigma_(2)`
`:.` Electric field at a point is equal & opposite in direction.
`sigma_(1)+sigma_(2)=0 rArr sigma_(1)=-sigma_(2)`
[B] `sigma_(1)+sigma_(2) gt 0 rArr sigma_(1) & sigma_(2)`
either both positive ot opposite but positive has a greater magnitude. So the net electric field will be away from the plates in region I & III.
[C] Same explanation according to [B].