CBSE Class 12 Physics Sample Paper 2015 Set 09

1. Define electric dipole moment and write its dimensions. 

2. Calculate the electrostatic force between two alpha particles separated by a distance 3.2× 10^-15m. 

3. What is capacitive reactance? What is its value for direct current? 

4. What are the dimensions and value of 1/(μ₀ Ɛ₀ )? 

5. What is meant by wattles current? How can we obtain wattles current in a.c. circuits? 

6. Name the two conservation laws implied in Kirchhoff’s laws for electric circuits. 

7. If an electron or proton is not deflected while passing through a region, can we be sure that there is no magnetic field in that region? Justify. 

8. A coil placed in the plane of paper has a current in clockwise direction when looking from above. What will be the change in the magnetic field at the centre of the coil if (i) the current through the coil is reduced to half, (ii) the radius of the coil is doubled? (1)

9. Prove that an ideal inductor does not dissipate power in an a.c. circuit. 

10. Two coherent sources whose intensity ratio is 100:1 produce interference fringes. Calculate the ratio of intensities of maxima and minima in the fringe-system. 

11. Draw a diagram of a telescope showing image formation at D. Write the expression for its magnification.

OR

Draw a diagram of a compound microscope showing image formation at D. Write the expression for its magnification. 

12. State and prove Brewster`s law. 

Please click the below link to access CBSE Class 12 Physics Sample Paper 2015 Set I