CBSE Class 12 Physics HOTs All Chapters Answers

HINTS FOR CLASS-XII(PHYSICS) – HOTS FOR THE YEAR-2009-10

HINTS FOR HOTS-CLASS-XII(PHYSICS)

UNIT-1

HINTS FOR ELECTROSTAICS

1. In the dielectric medium between the plates.

2. High potential, as electrons are negatively charged.

3. Zero

4. Zero

5. ML-1T-2

6. Zero

7. No.

8. Because they are indicators of electric field, extending to infinite distance.

9. C is proportional to A (area) Therefore C2 = 2C1 Since C = Q/V ,So the slope represents more capacitance. Hence P represents C2,Q represents C1

10. Each charge experiences two forces each of magnitude F inclined at an angle of 600.Their resultant is given by [F2 + F2 +2F2cos 60]1/2 = Ö3.F

11. (i)According to defn of P.D., VP>VQ .So VP-VQ is +ve for q>0. 

      (ii)For q<0, VQ >VP .So VP-VQ is -ve

12. Flux = 0, since Qen = 0

13. Due to polaraisation,opposing electric field is created.

14. Electric field at the midpoint of a dipole of length 2a is 2kq/a pointing towards the –ve charge or in the direction opposite to the dipole moment.

15. Inside the cavity field at any point is uniform and non zero.

16. No. If the initial velocity of the charged particle makes a certain angle with a line of force, then the charged particle shall not move along the line of force.

17. E= -dv/dr= -d(q/4πεor)/dr = q/4πεor2

18. Yes, at the mid point of electric dipole.

19. U = kq2/a- kq2/2a- kq2/2a = 0.

20. C’ = C+C+C = 3C = 75μF Therefore, charge = 75μF x 4200 V = 315 mC*

21. Total ф = q0/εo = 2/εo ,→ flux through one face = ф/6 = 1/3 εo.

Please refer to attached file for HOTs Answers