Question

Can anyone one tell me how this root part occurred or how it is calculated????​

Answer 1

Answer:

it's in the formula of vector addition

Answer 2

Answer:

Resultant of two vectors.

PLZ:

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Explanation:

in the derivation he is trying to find Electric field due to dipole.We know that dipole constitutes of two oppositively charged charges which are separated by a fixed distance.

                        So,he found individual electric field due to both charges at P.Since,Electric field is a vector it needs to be added vectorially.

                      The square root one which is present there is the formula for finding resulatant of two vectors.Here those two vectors are electric fields.

                              HOPE THIS HELPS