Q. 24.5( 8 Votes )

A point charge is brought in an electric field. The electric field at a nearby point.
A. will increase if the charge is positive

B. will decrease if the charge is negative

C. may increase if the charge is positive.

D. may decrease if the charge is negative.

Answer :

Option (c) is correct:


In an electric field, if a positive charge is placed, then the charge itself will generate some electric field on its own diverging from the point.


At a nearby point Q (towards the direction of external field), the field will increase as the field lines from the charge will also add to external field lines.


At a nearby point P (away from the direction of external field), the field will decrease as the field lines from the charge will cancel some of the external field lines.



Therefore, at a nearby point, field can either increase or decrease.


Option (d) is correct:


In an electric field, if a negative charge is placed, then the charge itself will generate some electric field on its own converging to the point.


At a nearby point Q (towards the direction of external field), the field will decrease as the field lines from the charge will cancel some of the external field lines.


At a nearby point P (away from the direction of external field), the field will increase as the field lines from the charge will add on to the external field lines.



Therefore, at a nearby point, field can either increase or decrease.

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