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This mock test of Test: Electric Flux for Class 12 helps you for every Class 12 entrance exam.
This contains 10 Multiple Choice Questions for Class 12 Test: Electric Flux (mcq) to study with solutions a complete question bank.
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QUESTION: 1

If the electric field is given by 26i – k. Calculate the electric flux through a surface of area 20 units lying in x-y plane.

Solution:

QUESTION: 2

The direction of force on a negative charge placed at any point in an electric field is given by

Solution:

Force **F** = q×**E**, where q is the charge and E is electric field.

When charge is negative, then **F** = -q×**E, **i.e., force is in opposite direction of electric field

QUESTION: 3

Electric flux through an area dA for an electric field E is given by

Solution:

QUESTION: 4

A neutral point lies at the centre of the line joining the charges when

Solution:

Neutral point due to a system of two like point charges For this case neutral point is obtained at an internal point along the line joining two like charges.Here neutral point lies outside the line joining two unlike charges and also it lies nearer to the charge which is smaller in magnitude.

QUESTION: 5

Choose the correct statement:

Solution:

QUESTION: 6

Electric flux is a _______ quantity

Solution:

**Electric flux** is a scalar **quantity**. **Electric Flux** is dot/scalar product of magnetic **field** vector and area vector. And the result of a dot/scalar **quantity** is always a scalar **quantity**. So **electric flux** is also a scalar **quantity**

QUESTION: 7

If the electric field is given by 6i+3j+4k calculate the electric flux through a surface of area 20 units lying in y-z plane.

Solution:

Area = 20 i since it is in the Y-Z plane

E = 6i+3j+4k

E.S = Flux

=20*6 = 120 units

QUESTION: 8

Electric lines of force never intersect each other because

Solution:

Electric lines of force never intersect each other because at the point of intersection, two tangents can be drawn to the two lines of force. This means two direction of electric field at the point of intersection, which is not possible.

QUESTION: 9

Dimensional formula of Ø_{E} is

Solution:

Flux= E. A

-> F=Eq

-> E= F/q= N/C

-> flux= N/C×m²

= NC^{-1}m^{2}

QUESTION: 10

Electric flux density is a function of _______

Solution:

Electric flux density is the charge per unit area. Hence it is a function of charge and not any of the other values.

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