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Electric Charges and Fields Class 12 MCQ

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Electric Charges and Fields Class 12 MCQ. We covered all the Electric Charges and Fields Class 12 MCQ in this post for free so that you can practice well for the exam.

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MCQ on Electric Charges and Fields for Class 12 Students

If an electron has an initial velocity in a direction different from that of an electric field the path of an electron is.

1. a circle

2. a parabola

3. a sphere

4. an ellipse

Option 2 – a parabola

The magnitude of the electric field strength such that an electron placed in it experience an electrical force would equal to its weight is given by

1. e/mg

2. mg/e

3. mg x e

4. None

Option 2 – mg/e

Which State of India experiences the maximum annual variation of rainfall?

(A) Meghalaya

(B) Kerala

(C) Rajasthan

(D) West Bengal

Show Answer

Two point charges Q and – 3Q are placed at some distance apart. If the electric field at the location of Q is E, then at the locality of -3Q, it is.

1. E/3

2.-2E

3. E/2

4. -E/3

Option 4 – -E/3

A charge q is placed at the center of the joining two equal charges Q. The system of three charges will be in equilibrium if q is equal to

1.- Q/4

2. + Q/2

3. -4Q

4. – Q/2

Option 1 – – Q/4

Pakyong Airport is located in?

(A) Sikkim

(B) Jammu and Kashmir

(C) Arunachal Pradesh

(D) Mizoram

Show Answer

If one penetrates a uniformly charged hollow sphere the electric field strength E.

1. is zero at all points

2. it increases

3. it decreases

4. remains the same at the surface

Option 1 – is zero at all points

Two identical spheres Q and -2Q experience a force F at a certain distance, if the bodies are kept in contact and then placed at the same initial distance. Find the force between them.

1. F¹ = -8F

2. F¹ = 4F

3. F¹ = 8F

4. F¹ = 2F

Option 1 – F¹ = -8F

An infinite number of charges of equal magnitude q but of opposite sign are placed along the x-axis at x-1, x=2, x=4, x=8……… and so on. The electric potential at the point x = 0 due to these charges will be.

1. 2q/3

2. q/3

3. q/2

4. q

Option 1 – 2q/3

The electric potential V at any point x,y,z in space is given by V = 4×2 volt. The electric field at the point in volt/meter is

1. 16 along the positive – x-axis.

2. 8 along the negative – x-axis

3. 8 along the positive – y-axis

4. 16 along the negative – y-axis

Option 2 – 8 along the negative – x-axis

Two charges q and q₂ are placed in a vacuum at a distance d and the force acting between them is F. If a medium of dielectric constant 4 is introduced around them, the force now will be.

1. F/4

2. F/2

3. F

4. F 0

Option 1 – F/4

Two equal negative charges -q are fixed at points (0, a), and (0, -a). A positive charge Q is released from rest at the point (2a,0) on the x-axis, and the charge Q will be

1. execute a simple Harmonic about the origin

2. move to infinity

3. execute oscillations but not simple Harmonic motion

4. None of above

Option 2 – move to infinity

A hollow metal sphere of radius 5cm is charged such that the potential on its surface is 10V. The potential at the center of the sphere is.

1. 10V

2. 5V

3. 0V

4. Same as at point 25 cm away from the surface

Option 1 – 10V

A small metal ball is suspended in a uniform electric field with the help of an insulated thread. If a high-energy x-ray beam falls.

1. the ball will not deflect at all

2. the ball will fly to infinite

3. the ball will be deflected opposite direction to the field

4. the ball will be deflected in the direction of field

Option 4 – the ball will be deflected in the direction of field

Fire rubber balls numbered 1 to 5 are suspended using separate threads. pairs (1,2) (24), (4,1) show electrostatic attraction, while pairs (2,3), (4,5) show repulsion. This implies that ball ‘1’ must be.

1. Positively charged

2. Neutral

3. Negatively charged

4. None of above

Option 2 – Neutral

Two charges in the air experience a coulomb force of 20N. If the space between them is filled with a medium of dielectric constant K = 5. What will be a new force?

1. 8N

2. 6N

3. 5N

4. 2N

Option 3 – 5N

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