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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NEET 2023 - Target Batch - Aryan Raj Singh
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Dimensional formula of ke2Gmemp is:
1. [M1L1T1]
2. [M0L1T1]
3. [M0L0T0]
4. [M-1L0T2]

Subtopic:  Coulomb's Law |
 72%
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NEET 2023 - Target Batch - Aryan Raj Singh
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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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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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An electric dipole with dipole moment  4×10-9 C m is aligned at 30° with the direction of a uniform electric field of magnitude 5×104 NC-1. 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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NEET 2023 - Target Batch - Aryan Raj Singh
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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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A polythene piece rubbed with wool is found to have a negative charge of 3×10-7 C. 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  6.5×10-7 C? 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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