CBSE Class 12 Physics Revision Assignment Set 04

1. What are the elements of earth magnetic field at a place?

2. a) Differentiate between dia, para, ferro magnetic substance with two examples each.

b) Draw susceptibility versus temperature graph.

3. What is displacement current? Derive its value from Maxwell – Ampere relation.

4. Draw the e.m spectrum with their frequencies. Mention two uses of each radiation.

5. If a shunt of value 1/n times the galvanometer resistance applied to a moving coil galvanometer. By what factor will its current sensitivity change?

6. What is difference between electric field produced by induction and those produced by static charges?

7. A rectangular conducting loop moves horizontally in a uniform magnetic field B perpendicular to its plane:

i) Will there be any induced current in the loop or any work required to move the loop if the loop is completely in the field ?

ii) What if the loop is stationary and the field changes with time?

8. A metal rod 1.5 m long rotates about its one end in a vertical plane at right angles to the magnetic meridian. If the frequency is 20 rev/sec, find the emf induced between the ends of the rod.

9. The magnetic flux linked with the loop of wire of area vector A=30i+16j+23k cm is 6 micro Wb. Calculate the magnetic field acting at right angle to the plane of the loop of the wire.

10. a) Self induction is called the inertia of electricity. Explain.

b) Give two applications of eddy current.

c) How does the self inductance of a coil change when the number of turns in the coil is decreased and an iron rod is introduced into it? Justify your answer.

Please click the below link to access CBSE Class 12 Physics Revision Assignment Set D