# PHYSICS QUESTION BANK FOR CLASS 12th [ENGLISH]

PHYSICS QUESTION BANK FOR CLASS 12th

Question no. : 1

Explain the difference between the electric force and the force of gravity acting between two charged particles.

Question no. : 2

Write the law of coulomb and write the definition of unit charge based on this law.

Question no. : 3

The air has 2 X 10 -7 and  3 X 10 -7 charges on two small charged spheres placed at a distance of 30 cm from each other How much force is there between them ?

Question no. : 4

Explain the reason – why ?

(i) Stable electric field lines are a continuous curve. Why ?

(ii) Two field lines never intersect each other. Why ?

Question no. : 5

When the glass rods are rubbed with a piece of silk, both get charged. A similar phenomenon is observed in other pairs of objects. Explain how this observation is consistent with the law of charge conservation ?

Question no. : 6

An infinite linear charge generates 9 X 10 4 N / C electric field at distance of cm Find the linear charge density.

Question no. : 7

To rub a piece of wool on the richest 3 X 10 7 C of the charge on the charged was found.

(a)     Estimate the number of electrons transferred (from which substance to which substance).

Does the coating also transfer from wool to polyethylene ?

Question no. : 8

What is meant by intensity of electric field Write its SI quantitative and dimensional formula.

Question no. : 9

Find the expression of the intensity of the electric field due to the point charge.

Question no. : 10

Explain (i) conduction method and (ii) i

Question no. : 1

A black box on the page has been carefully measure the electric field indicates that the net flux through the box page 80 X 10 3 Nm 2 / C is.

(a)    What is the net charge inside the box ?

(b)    If the net outward flux from the page of the box is zero, would you conclude that there is no charge inside the box Why or why not ?

Question no. : 2

Question no. : 3

Find the expression of the intensity of the electric field at a point in the axial position due to an electric dipole.

Question no. : 4

Check to make sure that ke 2 / Gm p m e is uninsured. Find the value of this ratio by looking at the table of physical constants. What does this ratio mean ?

Question no. : 5

4 X 10 9 Cm dipole moment of an electric dipole, 5 X 10 4 NC 1 volume of a uniform electric field direction 30 0 Align is. Calculate the magnitude of the force moment acting on the bipolar.

Question no. : 6

The electric flux is -1.0 X 10 3 Nm 2 / C on a spherical Gaussian surface of radius 10 cm drawn with that point as the center due to a point charge .

(a)    If the radius of Gaussian page is doubled, how much flux will pass through the page ?

(b)    What is the value of point charge ?

Question no. : 7

In a uniform electric field, establish the formula required for the bipolar moment to be applied to an electric dipole. Explain the dipole moment with its help.

Question no. : 8

Write Gauss’s theorem and incorporate Coulomb’s inverse class rule.

Question no. : 9

What is meant by potential energy of electric dipole A similar situation in the power sector while the dipole axis direction of the field from the angle θ makes in the potential energy, get the expression.nduction method of charging a conductor.

1. 