12 physics chapter 1 | exercise question solutions | electric charge and fields exercise questions solution | 12 physics chapter 1 exercise solutions |

In this video I discussed about the exercise questions solution of class 12 physics chapter 1 | electric charge and fields questions are
1.A system has two charges qA = 2.5 × 10–7 C and qB = –2.5 × 10–7 C located at points A: (0, 0, –15 cm) and B: (0,0, +15 cm), respectively. What are the total charge and electric dipole moment of the system?
2.An electric dipole with dipole moment 4 × 10–9 C m is aligned at 30° with the direction of a uniform electric field of magnitude 5 × 104 NC–1 . Calculate the magnitude of the torque acting on the dipole.
3. A polythene piece rubbed with wool is found to have a negative charge of 3 × 10–7 C. (a) Estimate the number of electrons transferred (from which to which?) (b) Is there a transfer of mass from wool to polythene?
4.Two insulated charged copper spheres A and B have their centres separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is 6.5 × 10–7 C? The radii of A and B are negligible compared to the distance of separation
5.Consider a uniform electric field E = 3 × 103 î N/C. (a) What is the flux of this field through a square of 10 cm on a side whose plane is parallel to the yz plane? (b) What is the flux through the same square if the normal to its plane makes a 60° angle with the x-axis?
6.What is the net flux of the uniform electric field through a cube of side 20 cm oriented so that its faces are parallel to the coordinate planes?

Time stamps:
0:00 introduction
0:47 Exercise 1.9 solution
5:50 Exercise 1.10 solution
8:27 Exercise 1.11 solution
13:00 Exercise 1.12 solution
17:11 Exercise 1.14 solution
21:23 Exercise 1.15 solution

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