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Electrostatics question bank (Physics)

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Q1.

The electric potential 'V' as a function of distance x (in metre) is $V = 4x^2 + 6x - 8$ volt. Electric field at $x = 2$ m is

(A)

$-11\ \text{V/m}$

(B)

$-22\ \text{V/m}$

(C)

$-16\ \text{Vm}$

(D)

$-8\ \text{V/m}$

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Q2.

Two charges $q_1$ and $q_2$ are separated with distance 'd' and placed in a medium of dielectric constant 'k'. The equivalent distance between charges in air for the same electrostatic force is

(A)

$\dfrac{d}{\sqrt{k}}$

(B)

$\sqrt{\dfrac{k}{d}}$

(C)

$d\sqrt{k}$

(D)

$k\sqrt{d}$

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