Draw magnetic field lines of straight current carrying conductor on a cardboard
Answers
Answer:
Explanation:
(a) Take a battery (12V), a variable resistance, an ammeter (0 - 5A), a plug key and a long straight thick copper wire.
(b) Insert the thick wire through the centre, normal to the plane of a rectangular cardboard.
(c) Connect the copper wire vertically between X and Y as shown in series with battery, a plug key and a rheostat.
(d) Sprinkle some iron filings uniformly on the cardboard.
(e) Keep the variable of the rheostat at a fixed position and note the current through the ammeter.
(f) Close the key so that a current flows through the wire. Gently tap the cardboard a few times. Observe the pattern of the iron filings.
(ii) To find the direction of magnetic field lines, place a compass at a point P over a circle and observe the direction of the needle. The direction of north pole of the compass would give the direction of magnetic field lines. Maxwell's Right Hand Thumb Rule is used to find the direction of magnetic field lines. It states that "Imagine you are holding a current carrying conductor in your right hand such that the thumb points in the direction of current. Then your fingers will wrap around the conductor in the direction of the magnetic field lines."
