Select Chapter Topics:

# A spherical conductor of radius $$10~\text{cm}$$ has a charge of $$3.2 \times 10^{-7}~\text{C}$$ distributed uniformly. What is the magnitude of the electric field at a point $$15~\text{cm}$$ from the center of the sphere? $$\dfrac{1}{4\pi \varepsilon _0} = 9\times 10^9~\text{N-m}^2/\text{C}^2$$ 1. $$1.28\times 10^{5}~\text{N/C}$$ 2. $$1.28\times 10^{6}~\text{N/C}$$ 3. $$1.28\times 10^{7}~\text{N/C}$$ 4. $$1.28\times 10^{4}~\text{N/C}$$

Subtopic:  Electric Field |
64%
From NCERT
NEET - 2020
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A polythene piece rubbed with wool is found to have a negative charge of $$3 \times10^{-7}~\text{C}$$. Transfer of mass from wool to polythene is:
1. $$0.7\times10^{-18}~\text{kg}$$
2. $$1.7\times10^{-17}~\text{kg}$$
3. $$0.7\times10^{-17}~\text{kg}$$
4. $$1.7\times10^{-18}~\text{kg}$$

Subtopic:  Electric Charge |
60%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In a certain region of space, the electric field is along the $$z\text-$$direction throughout. The magnitude of the electric field is, however, not constant but increases uniformly along the positive $$z\text-$$direction, at the rate of $$10^{5}$$ NC–1 per meter. What is the torque experienced by a system having a total dipole moment equal to $$10^{-7}~\text{C-m}$$${}^{}$ in the negative $$z\text{-}$$direction?
 1 ${}^{}$$$10^{-2}~\text{N-m}$$ 2 $$0$$ 3 ${}^{}$$$10^{-1}~\text{N-m}$$ 4 $$0.01~\text{N-m}$$
Subtopic:  Electric Dipole |
67%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A hollow metal sphere of radius $$R$$ is uniformly charged. The electric field due to the sphere at a distance $$r$$ from the centre:

 1 decreases as $$r$$ increases for $$rR$$. 2 increases as $$r$$ increases for $$rR$$. 3 is zero as $$r$$ increases for $$rR$$. 4 is zero as $$r$$ increases for $$rR$$.
Subtopic:  Gauss's Law |
81%
From NCERT
NEET - 2019
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Four charges are arranged at the corners of a square $$ABCD$$ as shown in the figure. The force on a positive charge kept at the center of the square is:

 1 zero 2 along diagonal $$AC$$ 3 along diagonal $$BD$$ 4 perpendicular to the side $$AB$$

Subtopic:  Coulomb's Law |
68%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A point charge $$q$$ is placed at the center of the open face of a hemispherical surface as shown in the figure. The flux linked with the surface is:

1. zero
2. $$\frac{q}{2\varepsilon_0}$$
3. $$\frac{q}{\varepsilon_0}$$
4. $$q \pi r^2$$

Subtopic:  Gauss's Law |
73%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A charged particle q of mass m is released on the $$y\text-$$axis at $$y=a$$ in an electric field $$\vec E = -4y \hat{j}.$$ The speed of particle on reaching the origin will be:
1. $$\sqrt{\frac{2 a}{m q}}$$
2. $$\frac{a}{\sqrt{m q}}$$
3. $$2 a \sqrt{\frac{q}{m}}$$
4. $$2 \sqrt{\frac{a}{m q}}$$

Subtopic:  Electric Field |
73%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Two point dipoles of dipole moment $$\vec{p}_{1}$$ and $$\vec{p}_{2}$$ are at a distance $$x$$ from each other and $$\vec{p}_{1} \left|\right| \vec{p}_{2}$$. The force between the dipole is:
1. $$\frac{1}{4 π\varepsilon_{0}} \frac{4 p_{1} p_{2}}{x^{4}}$$
2. $$\frac{1}{4 π\varepsilon_{0}} \frac{3 p_{1} p_{2}}{x^{3}}$$
3. $$\frac{1}{4π\varepsilon_{0}} \frac{6 p_{1} p_{2}}{x^{4}}$$
4. $$\frac{1}{4 π\varepsilon_{0}} \frac{8 p_{1} p_{2}}{x^{4}}$$

Subtopic:  Electric Dipole |
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

An electric dipole is placed at the centre of a sphere. Which of the following statements is correct?

 1 The electric flux through the sphere is zero. 2 The electric field is zero at every point on the sphere. 3 The electric field is zero at every point inside the sphere. 4 The electric field is uniform inside the sphere.
Subtopic:  Electric Dipole |
69%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

An electric dipole is kept at the origin as shown in the diagram. The point $$A, B, C$$ are on a circular arc with the centre of curvature at the origin. If the electric fields at $$A, B$$ and $$C$$ respectively are $$\vec E_1,\vec E_2,\vec E_3,$$ then which of the following is incorrect? $$\left ( d\gg l \right )$$

1. $$\vec E_1=-\vec E_3$$
2. $$\vec E_1=-2\vec E_2$$
3. $$\vec E_1=\vec E_3$$
4. $$\vec E_3=-2\vec E_2$$

Subtopic:  Electric Dipole |
50%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints