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Here, we have provided class 12 physics ncert exercise questions of ch 1 Electric Charges and Fields to assist candidates in their preparation of board exams and competitive exams such as JEE, NEET, etc. The first chapter in class 12th Physics subject is Electric Charges and Fields. And this chapter discusses the details and various types of electric charges.
One of the smartest ways to get answers for any of your queries in chapter 1 physics is by attempting the NCERT Exercise Questions of Electric Charges and Fields once completing the learnings of the whole concept. Question 1. What is the force between two small charged spheres having charges of 2 x 10 -7 C and 3 x 10 -7 C placed 30 cm apart in air? Question 2. The electrostatic force on a small sphere of charge 0. Answer: a Force on charge 1 due to charge 2 is given by the relation.
Question 3. Look up a Table of Physical Constants and determine the value of this ratio. What does the ratio signify? Answer: Thus, the given ratio is a number and is dimensionless. This ratio signifies that electrostatic force between electron and proton is very-very large as compared to the gravitational force between them. Question 4. Answer: a Total charge on a body is equal to integral multiple of charge on an electron e.
In such cases the charge may be treated as continuous and not quantised. Question 5. When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.
Answer: On rubbing, the electrons are transferred from one body to the other. For example, when glass rod is rubbed with a piece of silk cloth, electrons from the glass rod are transferred to the piece of silk cloth. Silk and glass are neutral before rubbing and after rubbing the total charges on glass as well as silk taken together are once again zero. Similar phenomenon is observed with other pairs of bodies.
Thus, in an isolated system the total charge is neither created nor destroyed, the charge is simply transferred from one body to the other. This observation is consistent with the law of conservation of charges. Question 6. Question 7. That is, a field line cannot have sudden breaks. Why not? Answer: a An electrostatic field line starts from a positive charge and ends at a negative charge. The tangent to this line at any point represents the direction of the field at that point.
Since electric field is continuous so the field line has to be continuous. This is not possible. Hence, two field lines cannot cross each other. Question 8. Question 9. What are the total charge and electic dipole moment of the system? Answer: Clearly, the given points are lying on z-axis. Question Calculate the magnitude of the torque acting on the dipole. A polythene piece rubbed with wool is found to have a negative charge of 3. What is the mutual force of electrostatic repulsion if the charge on each is 6.
The radii of A and B are negligible compared to the distance of separation. Suppose the spheres A and B in Q 1. A third sphere of the same size but uncharged is brought in contact with the first, then brought in contact with the second, and finally removed from both.
What is the new force of repulsion between A and B? Answer: Charge on sphere A on contact with third sphere say C having no charge is given by When third sphere, how having charge 3.
Figure shows tracks of three charged particles in a uniform electrostatic field. Give the signs of the three charges. Which particle has the highest charge to mass ratio? Answer: Unlike charges attract each other, therefore particle 1 and 2 are negatively charged whereas particle 3 has positive charge. Answer: a Electric flux through the square,. What is the net flux of the uniform electric field of Problem 1. Answer: Zero, because number of field lines entering the cube is equal to the number of field lines coming out of the cube.
Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the box is 8. Answer: a What is the net charge inside the box? Why or why not? It can only be said that net charge inside the box is zero. What is the magnitude of the electric flux through the square? Think of the square as one fact of a cube with edge 10 cm. A point charge of 2. What is the net electric flux through the surface?
A point charge causes an electric flux of Answer: a The electric flux depends only on the charge enclosed by the Gaussian surface and independent of the size of the Gaussian surface. The electric flux through new Gaussian surface remains same i. If the electric field 20 cm from the center of the sphere is 1. Answer: Question A uniformly charged conducting sphere of 2. Calculate the linear charge density Answer:.
Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude What is E : a in the outer region of the first plate, b in the outer region of the second plate, and c between the plates? An oil drop of 12 excess electrons is held stationary under a constant electric field of 2. The density of the oil is 1. Answer: Charge on drop,. Which among the curves shown in figure cannot possibly represent electrostatic field lines?
Answer: a Incorrect, because the field lines should be normal to the surface of a conductor. 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 10 5 N C -1 per meter.
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? Answer: Suppose the dipole is along z-axis. Show that the entire charge must appear on the outer surface of the conductor. Suggest a possible way. Answer: Select a Gaussian surface lying wholly inside the conductor but very near to the surface of the conductor. Then it can be said that the charge lies outside the Gaussian surface e. A hollow charged conductor has a tiny hole cut into its surface.
Answer: Let the tiny hole of the conductor be considered as filled up. Field inside the conductor is zero, whereas outside it is given by This field is infact due to 1 field E 1 due to plugged hole and 2 field E 2 due to rest of the charged conductor. Inside the conductor, these fields are equal but opposite, whereas outside they are exactly same. Let P be a point lying on the y-axis Question It is now believed that protons and neutrons which constitute nuclei of ordinary matter are themselves build out of more elementary units called quarks.
A proton and a neutron consist of three quarks each. Quarks of other types have also been found which give rise to different unusual varieties of matter.
Suggest a possible quark composition of a proton and neutron. A small test charge is placed at a null point i. Show that the equilibrium of the test charge is necessarily unstable. Answer: a Let the given system be in stable equilibrium.
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