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The force between two small charged spheres having charges of $$2\times 10^{-7}$$ C and $$3\times 10^{-7}$$ C placed $$30$$ cm apart in the air is:
1. $$6 \times 10^{-3}~ \mathrm{N}$$
2. $$5 \times 10^{-3}~ \mathrm{N}$$
3. $$4 \times 10^{-4}~ \mathrm{N}$$
4. $$5 \times 10^{-4}~ \mathrm{N}$$

Subtopic:  Coulomb's Law |
84%
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in the air is 0.2 N. The distance between the two spheres is:

1. 14 cm
2. 12 cm
3. 16 cm
4. 10 cm

Subtopic:  Coulomb's Law |
76%
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Dimensional formula of $\frac{k{e}^{2}}{G{m}_{e}{m}_{p}}$ is:
1. [M1L1T1]
2. [M0L1T1]
3. [M0L0T0]
4. [M-1L0T2]

Subtopic:  Coulomb's Law |
72%
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Four point charges qA = 2μc, qB = -5μc, qC = 2μc and qD = -5μc are located at corners of a square ABCD of side 10 cm. The force on a charge of 1μc placed at the center of the square is:

1. 2 N
2. 1 N
3. 5 N
4. 0 N

Subtopic:  Coulomb's Law |
81%
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Two point charges qA = 3 µC and qB= –3 µC are located 20 cm apart in a vacuum. The electric field at the midpoint O of the line AB joining the two charges is:

1. 4.5×106 N/C along OA
2. 5.4×106 N/C along OA
3. 4.5×106 N/C along OB
4. 5.4×106 N/C along OB

Subtopic:  Electric Field |
58%
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NEET 2023 - Target Batch - Aryan Raj Singh

A system has two charges, $$q_\mathrm{A} = 2.5 \times 10^{-7}~\text{C}$$ and $$q_\mathrm{B} = -2.5 \times 10^{-7}~\text{C}$$, is located at points $$\mathrm{A}$$$$(0,0,-15~\text{cm})$$ and $$\mathrm{B}$$: $$(0,0,+15~\text{cm})$$ respectively. The electric dipole moment of the system is:

 1 $$7.5\times 10^{-8}~\text{C-m}~(\text{along negative z-axis})$$ 2 $$8.5\times 10^{-8}~\text{C-m}~(\text{along positive z-axis})$$ 3 $$5.5\times 10^{-8}~\text{C-m}~(\text{along positive z-axis})$$ 4 $$3.5\times 10^{-8}~\text{C-m}~(\text{along negative z-axis})$$

Subtopic:  Electric Dipole |
71%
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NEET 2023 - Target Batch - Aryan Raj Singh

An electric dipole with dipole moment   is aligned at 30° with the direction of a uniform electric field of magnitude  The magnitude of the torque acting on the dipole is:
1. 2 × 10−5 N m
2. 10−4 N m
3. 10−5 N m
4. 2 × 10−4 N m

Subtopic:  Electric Dipole |
80%
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Which of the following statements about electric field lines (due to static charges) is incorrect?

 1 electric field lines never cross each other at any point. 2 electric field lines do not form any closed loop. 3 electric field lines can not be taken as continuous curves. 4 electric field lines start from a positive charge and end on a negative charge.

Subtopic:  Electric Field |
77%
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NEET 2023 - Target Batch - Aryan Raj Singh

A polythene piece rubbed with wool is found to have a negative charge of . Transfer of mass from wool to polythene is:
1. 0.7 × 10 - 18   kg
2. 1.7 × 10 - 17   kg
3. 0.7 × 10 - 17   kg
4. 1.7 × 10 - 18   kg

Subtopic:  Electric Charge |
59%
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Two insulated charged copper spheres A and B have their centers separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is  ? The radii of A and B are negligible compared to the distance of separation.
1. 1.52 × 10−2 N
2. 3.7 × 10−2 N
3. 2.01 × 10−2 N
4. 2.23 × 10−1 N

Subtopic:  Coulomb's Law |
73%
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