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Question (1)

QN0038813

If a charge is placed at the centre of a closed hemispherical non-conducting surface, the total flux passing through the flat surface would be :

(A)
(B)
(C)
(D)
None

Correct Answer: D

Explanation:

(None) Total flux through complete spherical surface is .

So flux, through curved surface will be .

The flux through flat surface will be zero

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Question (2)

QN0038814

Number of electric lines of force that radiate outwards from one coulomb of charge in vacuum is

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

Here, Number of lines of force Electric force

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Question (3)

QN0038815

In the figure the net electric flux through the area is when the system is in air. On immersing the system in water the net electric flux through the area

(A)
becomes zero
(B)
remains same
(C)
increases
(D)
decreases

Correct Answer: D

Explanation:

Since electric field decreases inside water, therefore flux also decreases.

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Question (4)

QN0038816

A cylinder of radius and length is placed in a uniform electric field parallel to the axis of the cylinder. The total flux over the curved surface of the cylinder is

(A)
zero
(B)
(C)
(D)

Correct Answer: A

Explanation:

For the curved surface,

ds .

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Question (5)

QN0038817

Positive electric flux indicates that electric lines of force are directed

(A)
outwards
(B)
inwards
(C)
either (a) or (b)
(D)
None of these

Correct Answer: A

Explanation:

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Question (6)

QN0038818

Electric flux over a surface in an electric field may be

(A)
positive
(B)
zero
(C)
negative
(D)
All of these

Correct Answer: D

Explanation:

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Question (7)

QN0038819

Consider an electric field where is a constant. The flux through the shaded area (as shown in the figure) due to this field is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

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Question (8)

QN0038820

A surface has the area vector . The flux of an electric field through it if the field is :

(A)
(B)
(C)
(D)
zero

Correct Answer: A

Explanation:

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Question (9)

QN0038821

The electric field in a region of space is given by, where . The flux of the field through a circular surface of radius parallel to the plane is nearly:

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

(a)

Given, So,

Radius of circular surface

Area

[Loop is parallel to Y-Z plane]

Now, flux

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Question (1)

If a charge is placed at the centre of a closed hemispherical non-conducting surface, the total flux passing through the flat surface would be :

Explanation:

Link:

Question (2)

Number of electric lines of force that radiate outwards from one coulomb of charge in vacuum is

Explanation:

Link:

Question (3)

In the figure the net electric flux through the area is when the system is in air. On immersing the system in water the net electric flux through the area

Explanation:

Link:

Question (4)

A cylinder of radius and length is placed in a uniform electric field parallel to the axis of the cylinder. The total flux over the curved surface of the cylinder is

Explanation:

Link:

Question (5)

Positive electric flux indicates that electric lines of force are directed

Explanation:

Link:

Question (6)

Electric flux over a surface in an electric field may be

Explanation:

Link:

Question (7)

Consider an electric field where is a constant. The flux through the shaded area (as shown in the figure) due to this field is

Explanation:

Link:

Question (8)

A surface has the area vector . The flux of an electric field through it if the field is :

Explanation:

Link:

Question (9)

The electric field in a region of space is given by, where . The flux of the field through a circular surface of radius parallel to the plane is nearly:

Explanation:

Link:

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