Q. 24. What will be effect in deflection of needle if
Q. 25. If an electron enters in magnetic field from west direction , how will it deflect?
Q. 26. List the properties of magnetic field lines.
Q. 27. Why don’t two magnetic field intersect each other?
Q. 28. The magnetic field in a given region is uniform . Draw a diagram to represent it.
Q. 29. A alfa particle projected towards west is deflected towards north by a magnetic field.What is the direction of magnetic field?
Q. 30. What is MRI?
Q. 31. Name two organs inside our body where magnetic field produced?
Q. 32. What is electric motor? On which principle it work? Name two device in which it is used.
Q. 33. State Fleming left hand rule.
Q. 34. What is commutator?
Q. 35. What is armature? How electromagnet is more advantageous than a permanent magnet?
Q. 36. What is electro magnetic induction?
Q. 37. Give two ways to induce current in a coil
Q. 38. What are differences between AC & DC?
Q. 39. After what times AC changes its direction ? give frequency of current produced in india.
Q. 40. What is dynamo? On which principle it work?
Q. 41. What modification should do to get DC from AC generator?
Q. 42. What precaution should be taken to avoid the overloading of domestic circuits?
Q. 43. What is short circuits? When it occurs?
Q. 44. What is function of earth wire? Why it is necessary to earth a metallic appliance?
Q. 45. Give three methods of producing magnetic field.
