Please answer question number 5 - Physics - Electric Charges And Fields

Question

Please answer question number 5

Bakul Biswas · Accepted Answer

Dear Student,
we know,E=kqr2in the first case,r=2 m,then we getE=kq22=kq4⇒kq=4E 
(i)in the second case,let r' be the required distanceE'=E4⇒kqr'2=E4⇒4Er'2=E4  from(i)⇒4r'2=14⇒r'2=16⇒r'=16=4 moption(D) is correct
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