Magnetic Field due to Straight Conductor
Magnetic Field Due To Current Through A Straight Conductor
The magnetic field lines around a current carrying straight conductor are concentric circles whose centre lies on the wire. To visualize the pattern of the magnetic field around a straight current—carrying conductor, we will do an experiment:
Take a stiff copper wire and pass it through the centre of a card board. Then, connect a battery source, a variable resistance through a switch i.e. K as shown in the figure
Place a compass on the cardboard and start the current by closing the switch. Compass needle get deflected and its deflection show the direction of magnetic field.
1. Mark the position of the north pole of the needle on the cardboard.
2. Place the compass ahead so that the south pole of the needle lies at the point marked for the previous position of the north pole.
Which of the following are correct : (a) If we increase the current through the conductor the magnetic field intensity is decreased. (b) If we increase the current through the conductor the magnetic field intensity is increased. (c) The magnetic field lines around a current carrying straight conductor are concentric circles whose centre lies on the wire. | |||
| Right Option : B | |||
| View Explanation | |||
When we bring a magnetic compass near current carrying wire: | |||
| Right Option : B | |||
| View Explanation |
Which of the following are correct : (a) If we increase the current through the conductor the magnetic field intensity is increased. (b) The more distant a point is from a current—carrying wire, the more is the intensity of the magnetic field at that point. (c) If the direction of current is reversed, the field lines will still be circular, but the directions of the field lines will be reversed. | |||
| Right Option : C | |||
| View Explanation | |||
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