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Question

If the electric potential along a line due to a charge is given by V(r)=25r+3, where r is the distance from the charge, what is the electric field at a point r = 5 along this line?

A
1NC
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B
1NC
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C
5NC
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D
5NC
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Solution

The correct option is A 1NC
We are given an r dependent equation for potential. So we can directly find a relation for potential by differentiating the V equation.

\(V(r) = \frac{25}{r} +3\)
E(r)=dVdr
Er=25r2
At r = 5, E(5)=2525
E(5)=1NC

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