Question

-lonC whnt mognitde and sign change 2W MAbe che foree on chage a 2ero?

Answer 1

Charge at B - 7 Change at - c Charge at DD Corner B due ts charge S and - Se is 9wem belew Fi ce aetmg on eharge Fors ae timg chenge due t charge-c alo 2. that along the dliaguot

And to have net folee ση Chang Magnitude be qual t F1 lnt fnce and itsdireclon sho udel he dirceted alona DB A F and F3 0 #ence nature of charge, at - pos tut almq BA 2 2- as once ddue to

Net force en changea (ata) 2. 8,2 K) Hence charge on o and hature o f charge u te
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Steps :

Step1

Find electrostatic force on charge q at B due to charge at A and C respectively

Step2

Find resultant of above two forces using parallelogram law of vector. Its direction is along diagnol

Step3

Find force due to charge Qd at B and its direction is along diagnol of square

Step-4

Now subtract resultant forces of step 2 and force of step3

to get required value of charge at D