MAGNETIC FIELD & FIELD LINES
1. What effects do you expect on passing current through a conductor?
2. How it can be shown that a current carrying conductor produces a magnetic field?
3. Why compass always align itself in approximately north–south direction?
4. Why some substances exhibit magnetism naturally, while others don’t?
5. What do you mean by ‘magnetic field lines’?
6. List the characteristics of magnetic field lines?
7. How magnetic field lines are drawn?
8. How one can represent a region of uniform magnetic field using magnetic field lines?
9. Why two magnetic field lines never cross each other?
10. What is the direction of magnetic field line?
11. What is necessary to have a magnetic field?
12. What do you mean by magnetic field?
13. If equal number of electrons and proton travels in same direction, will there be any magnetic field
produced?
14. Is it possible that magnetic field line emerging out of north pole of one bar magnet can enter the south
pole of another bar magnet?
15. Can magnetic field lines of two different bar magnets cross each other on bringing the bar magnets
closer?
16. Consider that there is a long queue of electrons at rest. Will you experience any magnetic field moving
along this queue of electrons?
17. Can we separate north pole and south pole of a magnet?
18. What will happen if we break a bar magnet into two equal halves?
19. Magnetic fields in two different regions described by magnetic field lines as shown below.
Region 1 Region 2
What conclusion one can draw about the magnetic fields in region 1 and 2?
1. Show the magnetic field pattern produced due to a straight current carrying conductor.
2. Which rule can help us to find the direction of magnetic field lines around a straight current carrying
conductor?
3. What factors influence the magnetic field around a current carrying conductor?
4. What is a solenoid? How will you increase the magnetic field strength due to solenoid?
5. Show the magnetic field pattern produced due to current carrying circular loop and solenoid.
6. What is an electromagnet?
7. What is the difference between the magnetic field pattern of a solenoid and a bar magnet?
8. What you can say about magnetic field inside a solenoid?
9. When we can use right hand thumb rule?
10. Magnetic field at the center of a current carrying loop (in the plane of paper) is directed in the outward
direction. What will be the direction of the current flow?
11. What are electromagnets? Discuss their advantages over natural magnets.
12. A current is flowing vertically upward in a wire. What will be direction of field lines if
(a) wire is in front of you?
(b) wire is at your backside?
13. In the figure given below, find the direction of the current in the wire.
14. Can we change the pattern of magnetic field around a current carrying conductor? If yes then how?
15. What will happen to magnetic field strength of a current carrying solenoid if we increase the number of
loops?
MAGNETIC FORCE AND ELECTRIC MOTOR
1. On what factors, does the force experienced by a current carrying conductor placed inside a magnetic
field, depends?
2. How one can show experimentally that force on a current carrying conductor depends upon the
(a) direction of the magnetic field?
(b) direction of the flow of current?
3. Why is current carrying conductor experiences a force on placing it, inside a magnetic field?
4. When the force experienced by a straight current carrying conductor will be maximum?
5. How one can determine the direction of force on a straight current carrying conductor placed inside a
magnetic field?
6. Can the magnetic force, on a charge moving in magnetic field, accelerate the charge linearly?
7. In which direction, does the electron beam moving along the earth’s equator (from west to east) will
experience the force due to the earth’s magnetic field?
8. State the principle on which an electric motor works.
9. Name the device which converts electrical energy into mechanical energy?
9. Explain the working of an electric motor with the help of a labeled diagram.
10. What is the function of split rings in an electric motor?
11. How rotation of electric motor armature will be affected on (i) interchanging the magnetic poles (ii)
reversing battery polarity (iii) both (i) and (ii) simultaneously?
12. Can direction of flow of current, direction of magnetic field and magnetic force on that current carrying
conductor lie in same plane?
ELECTROMAGNETIC INDUCTION AND ELECTRIC GENERATOR
1. Explain the working of a galvanometer?
2. What is electromagnetic induction? Design an experiment to describe this phenomenon.
3. By how many different means one can induce current in a conductor?
4. What do you mean by A.C. (Alternating Current)?
5. State the principle on which electric generator works.
6. Explain the working of an electric generator using a labeled diagram.
7. If a bar magnet is moving with a constant speed with respect to a solenoid connected to a galvanometer.
What do you expect to observe?
8. What is the difference between an A.C. and a D.C. electric generator?
9. How and by whom electromagnetic induction was discovered?
10. State Fleming’s right hand rule. Name a device which works on this principle.
11. Why electromagnetic induction is termed so?
12. What is necessary to induce a current in a conductor?
13. What will happen to the output current of a D.C. generator if we:–
(a) increase the number of turns in armature coil?
(b) increase the magnetic pole strength?
(c) decrease the speed of rotation of armature coil?
(d) replace the split rings with two different complete rings attached to either end of armature coil?
DOMESTIC ELECTRICAL CIRCUITS
1. What type of load combination (parallel or series) is usually followed in domestic electrical circuits and
why?
2. Why earthing is done in an electrical circuit?
3. Briefly discuss the power distribution to a household circuitry.
4. What is the function of a fuse in an electrical circuit? What special characteristics should it possesses?
5. List the advantages of using fuse in an electrical circuit.
6. What colour scheme is generally used for the power wires?
7. What are the general specifications of electrical power we receive from the electricity board?
8. What is the difference between direct current and alternating current?