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Grade upto college level Engineering Entrance Exams

The electric field due to a positive charge at a distance 1 m is 4 NC–1. Its magnitude at distance 2 m will be
(A) 0.5 NC–1
(B) 1 NC–1
(C) 2 NC–1
(D) none of the above

Profile image of Amit Saxena
12 Years agoGrade upto college level
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3 Answers

Profile image of Radhika Batra
12 Years ago

Profile image of Arbaz IIIT
12 Years ago

E1=4 N/C,

r1=1,

therefore,E1=(k x q )/r1^2

q=E1/k ----------(1)

Given r2=2

E2=(k x q)/r2^2 [By substituting (1)]

E2=E1/4

E2=1

 

Ans:(B)

Profile image of vamsi
12 Years ago

E=4/4=1N/C


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