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JEE Main 4 September 2020, Shift 1, Physics Q11

Question 11 of 75 in this shift, Physics question 11 of 25.

A two point charges 4q and

-

q are fixed on the

x

-axis at

x=-\frac{d}{2}

and

x=\frac{d}{2}

, respectively. If a third point charge ‘q’ is taken from the origin to

x

=d along the semicircle as shown in the figure, the energy of the charge will :

The figure, in words

A horizontal axis with two tick marks, labelled 4q (left of a vertical line through the origin) and

-

q (right of the vertical line); a vertical line rises from the origin. A semicircular arc with arrowheads starts at the origin, goes up and over, and ends on the horizontal axis at a point to the right of the

-

q tick.

(1)decrease by $\frac{q^2}{4\pi\epsilon_0 d}$
(2)increase by $\frac{3q^2}{4\pi\epsilon_0 d}$
(3)decrease by $\frac{4q^2}{3\pi\epsilon_0 d}$ Official answer
(4)increase by $\frac{2q^2}{3\pi\epsilon_0 d}$

Official answer

Option 3

NTA final key (Sep 2020).

Chapter: Electrostatic Potential and Capacitance
Topic: Electric Potential
Idea tested: Work Done in Field

JEE Main 4 September 2020, Shift 1, Physics Q11

Same idea in other shifts