Magnetic field around a current carrying straight wire
ScienceSubject
8 minEstimated read
Activity 11.2
Magnetic field around a current carrying straight wire
Method
(a) Take a square piece of cardboard. Pierce it with a straight wire and connect the wire to an electric circuit.
(a) Place plotting compasses on the cardboard and position them around the wire.
(a) Turn on the switch to pass current through the wire and observe the needles of the compasses. Observe whether the needles around the wire rotate in a certain direction when the switch is turned on.
(a) Because there is no proper load in the circuit, turn the switch off immediately. Otherwise the wire heats up if the switch is left on for a long time.
(a) Swap the poles of the cell, turn the switch on again and observe whether the direction of the needles is opposite to the previous one.
(b) Pierce the cardboard with a straight wire as before and connect it to an electric circuit.
(b) Sprinkle very fine iron powder over the cardboard.
(b) Turn the circuit switch on and then tap the cardboard gently with your fingers.
(b) Observe whether the iron dust settles in a circular geometric pattern or not.
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