Q. 142. State some uses of magnets.
Q. 143. Describe with an activity to show that magnetic effect is produced when current passes through a conductor.
Q. 144. State Maxwell’s right hand grip rule. Describe the magnetic field produced circular coil.
Q. 145. What is solenoid? Describe the magnetic field produce on passing current through a solenoid.
Q. 146. State the factors on which the strength of magnetic field produced by a current carrying solenoid depends?
Q. 147. What do you understand by electromagnetic induction?
A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is
(a) Pushed into the coil with its north pole entering first.
(b) Held at rest inside the coil.
(c) Pulled out again?
Q. 148. Write Faraday’s laws of electromagnetic induction.
Q. 149. Why are the household electric appliances connected in parallel?
Q. 150. What is a fuse-wire? Why is it supposed a better safety device?
Q. 151. Many electrical appliances and circuits are “earthed” or “grounded” what is the reason for this?
