The number of electric field lines crossing an area `DeltaS is n_1 when Delta vecS||vecE`
Channel: Doubtnut
Date: 2020-07-26

The number of electric field lines crossing an area `DeltaS is n_1 when Delta vecS||vecE`, while the number of field lines crossing the same area is `n_2` when `DeltavecE` makes an angles of `30^@` with `vecE`. Then