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#1 Class Class 12 Physics Electric Potential & Capacitance 2019 Mcq 1M

If 125 water drops of equal radius and equal capacitance C, coalesce to form a single drop of capacitance C', the relation between C and C' is

A. C' = C/5

B. C' = 5C

C. C' = 25C

D. C' = C/25

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#2 Class Class 12 Physics Electric Potential & Capacitance 2018 Mcq 1M

If the uniform electric field exists along X-axis, then equipotential surface is along

A. XY-plane

B. XZ-plane

C. YZ-plane

D. anywhere

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CBSE

#3 Class Class 12 Physics Electric Potential & Capacitance 2020 Mcq 1M

A point P lies at a distance x from the midpoint of an electric dipole on its axis. The electric potential at Point P is proportional to

A. 1/x

B. 1/x²

C. 1/x³

D. x

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CBSE

#4 Class Class 12 Physics Electric Charge and Field 2022 Short 3M

A point charge +10 µC is at a distance 5 cm directly above the centre of a square of side 10 cm as shown in figure. What is the magnitude of the electric flux through the square?

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#5 Class Class 12 Physics Electric Charge and Field 2024 Short 2M

If the electric field is given by E = 6î + 3ĵ + 4k̂, calculate the electric flux through a surface of area 20 units lying in the yz-plane.

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#6 Class Class 12 Physics Electric Charge and Field 2023 Short 3M

In a certain region of space, electric field is along the z-direction throughout. The magnitude of electric field is however not constant but increases uniformly along the positive z-direction at the rate of 10⁵ N/C per metre. What are the force and torque experienced by a system having a total dipole moment equal to 10⁻⁷ C·m in the negative z-direction?

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#7 Class Class 12 Physics Electric Charge and Field 2023 Short 3M

Two charges of +25 × 10⁻⁹ C and -25 × 10⁻⁹ C are placed 6 m apart. Find the electric field at a point 4 m from the centre of the electric dipole (a) On axial line (b) On equatorial line.

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#8 Class Class 12 Physics Electric Charge and Field 2022 Short 3M

A particle of mass 10⁻³ kg and charge 5 µC is thrown at a speed of 20 m/s against a uniform electric field of strength 2 × 10⁵ N/C. How much distance will it travel before coming to rest momentarily?

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#9 Class Class 12 Physics Electric Charge and Field 2024 Short 2M

Two insulated charged copper spheres A and B each having charge of 6.5 × 10⁻⁷ C are separated by a distance 50 cm. If they are placed in water of dielectric constant 80, then find the electrostatic force of repulsion between them.

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CBSE

#10 Class Class 12 Physics Electric Charge and Field 2024 Short 3M

Three charges 10 µC, 5 µC and -5 µC are placed in air at the three corners A, B and C of an equilateral triangle of side 0.1 m. Find the resultant force experienced by the charge placed at corner A.

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#11 Class Class 12 Physics Electric Charge and Field 2024 Mcq 1M

Four equal charges each q are placed at the corners of a square of side a. Then the Coulomb force experienced by one charge due to the rest of three is:

A. (kq²/a²)(1/2 + √2)

B. (kq²/a²)(1 + 1/√2)

C. (kq²/a²)(2 + 1/√2)

D. (kq²/a²)(2√2 + 1)

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#12 Class Class 12 Physics Electric Charge and Field 2024 Short 2M

A charge "Q" is divided into two parts such that the electrostatic force between two parts is maximum. Find the charge on each part.

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#13 Class Class 12 Physics Electric Charge and Field 2024 Short 2M

Two point charges +2 µC and +4 µC repel each other with a force of 20 N. If a charge of −6 µC is added to each of them, what is the new electrostatic force?

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CBSE

#14 Class Class 12 Physics Electric Charge and Field 2011 Short 3M

A charge q = 1 mC is placed at point (1 m, 2 m, 4 m). Find the electric field at point P(0 m, -4 m, 3 m).

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#15 Class Class 12 Physics Electric Charge and Field 2010 Short 2M

Calculate the amount of work done in turning an electric dipole of dipole moment 3 × 10⁻⁸ C·m from its position of unstable equilibrium to the position of stable equilibrium in a uniform electric field of intensity 10³ N/C.

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#16 Class Class 12 Physics Electric Charge and Field 2016 Short 3M

An infinite number of charges each equal to q are placed along X-axis at x = 1, x = 2, x = 4, x = 8 and so on. Find the electric field at the point x = 0 due to this set up of charges.

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#17 Class Class 12 Physics Electric Charge and Field 2024 Short 2M

A metal sphere has a charge of −6 µC. When 5 × 10¹² electrons are removed from the sphere, what would be the net charge on it?

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#18 Class Class 12 Physics Electric Charge and Field 2015 Long 5M

A charge is distributed uniformly over a ring of radius R. Obtain an expression for the electric intensity E at a point on the axis of the ring. Hence show that for points at large distances from the ring, it behaves like a point charge.

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#19 Class Class 12 Physics Electric Charge and Field 2024 Long 5M

(i) Define electric intensity. (ii) Derive an expression for electric intensity at a point situated on the axis of an electric dipole.

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#20 Class Class 12 Physics Electric Charge and Field 2019 Long 5M

What is an electric dipole? Derive an expression for the torque acting on an electric dipole when held in a uniform electric field. Hence, define the dipole moment.

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