1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Point charges $-3 Q,-q, 2 q$ and $2 Q$ are placed, one at each corner of a square. The relation between Q and q for which the potential at the centre of the square is zero is
A
$Q=\frac{1}{q}$
B
$Q=-q$
C
$Q=\frac{-1}{q}$
D
$Q=q$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

For the charge configuration shown here, which of the following is not true?

COMEDK 2025 Morning Shift Physics - Electrostatics Question 11 English

A
$\frac{q_1}{q_2}=1$
B
$\left|q_1\right|=\left|q_2\right|$
C
$\left|q_1\right|>\left|q_2\right|$
D
$q_1$ and $q_2$ are negative
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two identical conducting balls having positive charges $q_1$ and $q_2$ are separated by a distance $r$. If they are made to touch each other and then separated to the same distance, the force between them will be
A
Same as before
B
zero
C
Less than before
D
More than before
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A neutral water molecule is placed in an electric field $$E=2.5 \times 10^4 \mathrm{NC}^{-1}$$. The work done to rotate it by $$180^{\circ}$$ is $$5 \times 10^{-25} \mathrm{~J}$$. Find the approximate separation of centre of charges.

A
$$1.25 \times 10^{-10} \mathrm{~m}$$
B
$$0.625 \times 10^{-10} \mathrm{~m}$$
C
$$0.625 \times 10^{-9} \mathrm{~m}$$
D
$$0.998 \times 10^{-10} \mathrm{~m}$$
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