KCET 2025 Physics Paper

The potential energy (PE) of an electric dipole in a uniform electric field is given by the formula:
PE=

→

−p

⋅

→

E

=−pE‌cos‌θ
Let's evaluate the potential energy for different angles:
(a) θ=180∘ :
PE=−pE‌cos‌180∘=pE
This corresponds to option (ii) in Column-II.
(b) θ=120∘ :
PE=−pE‌cos‌120∘=−pE(‌

−1

2

)=‌

pE

2

This corresponds to option (iii) in Column-II.
(c) θ=90∘ :
PE=−pE‌cos‌90∘=0
This corresponds to option (iv) in Column-II.
Thus, the correct matching is:
a⟶ (ii)
b⟶ (iii)
c⟶ (iv)