1
COMEDK 2024 Evening Shift
+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
$$0.998 \times 10^{-10} \mathrm{~m}$$
2
COMEDK 2024 Evening Shift
+1
-0

Two point charges $$\mathrm{M}$$ and $$\mathrm{N}$$ having charges $$+q$$ and $$-q$$ respectively are placed at a distance apart. Force acting between them is $$\mathrm{F}$$. If $$30 \%$$ of charge of $$\mathrm{N}$$ is transferred to $$\mathrm{M}$$, then the force between the charges becomes:

A
F
B
$$\frac{100}{49} F$$
C
$$\frac{49}{100} F$$
D
$$\frac{9}{16} F$$
3
COMEDK 2024 Evening Shift
+1
-0

If 216 drops of the same size are charged at $$200 \mathrm{~V}$$ each and they combine to form a bigger drop, the potential of the bigger drop will be

A
2400 V
B
7200 V
C
1200 V
D
8200 V
4
COMEDK 2024 Evening Shift
+1
-0

Three point charges are located on a circular arc at $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ as shown in the figure below. The total electric field at the centre of the $$\operatorname{arc}(\mathrm{C})$$ is

A
$$15000 \mathrm{~NC}^{-1}$$
B
$$10000 \mathrm{~N} \mathrm{C}^{-1}$$
C
$$20000 \mathrm{~NC}^{-1}$$
D
$$5000 \mathrm{~NC}^{-1}$$
EXAM MAP
Medical
NEET