Describe an activity with a neat diagram to demonstrate the presence of magnetic field around a current carrying straight conductor .
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1. Take a straight wire AB and pierced it through a horizontal cardboard such that wire AB is vertical.
2. The ends of the wire AB are connected to a battery.
3. Place some iron fillings on the cardboard.
4. Switched the key on.
5. Gently tap the cardboard.
6. The iron fillings arrange themselves in concentric circles around the wire.
7. This shows that magnetic field lines are concentric circles. The circles become larger and larger as we move away from the wire.
2. The ends of the wire AB are connected to a battery.
3. Place some iron fillings on the cardboard.
4. Switched the key on.
5. Gently tap the cardboard.
6. The iron fillings arrange themselves in concentric circles around the wire.
7. This shows that magnetic field lines are concentric circles. The circles become larger and larger as we move away from the wire.
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