Magnetic Effects of Current

1.  What do you mean by electromagnetism? State the right hand thumb rule for the direction of magnetic field by a current carrying conductor.                                                                  

2. What is a solenoid? On what factors does the strength of magnetic field produced by a current carrying solenoid depend?                                                                                     

3. List the differences between a bar magnet and an electromagnet.             

4. Give the expression for force acting on a current carrying conductor placed in magnetic field. Hence modify the expression for moving charges.                                               

5. State Fleming’s left hand rule for the direction of magnetic force.                 

6. What is the working principle of an electric motor? Give the construction and working of a D.C. Motor.                                                                                                   

7. What do you mean by electromagnetic induction? State the Fleming’s Right Hand rule for the direction of induced current.                                                                                       

8. Explain the working of an A.C. generator. Where is the constructional difference between A.C. and D.C. generator?