concentric circles, centre, opposite, polarity, straight conductor, reversed, same, circular conductor.

Fill in the blanks in the following passage(s) from the words given above.

The magnetic field produced around a straight current carrying conductor is in the form of ____ with the lying on the straight conductor. Take a copper wire AB. Pass it through a cardboard. Connect the wire to a battery through a key. Sprinkle some iron filings on the cardboard. Switch on the key and tap the cardboard gently. You will find that the iron filings arrange themselves in the form of concentric circles. Reverse the direction of current by changing the of the battery. You will find that this time too, the iron filings arrange themselves in concentric circle but in _ direction. Hence, the magnetic field lines of force around a carrying electric current are concentric circles with the conductor at the centre. The direction of magnetic field changes if the direction of current is _____.

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Solution

The magnetic field produced around a straight current carrying conductor is in the form of concentric circles with the centre lying on the straight conductor. Take a copper wire AB. Pass it through a cardboard. Connect the wire to a battery through a key. Sprinkle some iron filings on the cardboard. Switch on the key and tap the cardboard gently. You will find that the iron filings arrange themselves in the form of concentric circles. Reverse the direction of current by changing the polarity of the battery. You will find that this time too, the iron filings arrange themselves in concentric circle but in opposite direction. Hence, the magnetic field lines of force around a straight conductor carrying electric current are concentric circles with the conductor at the center. The direction of magnetic field changes if the direction of current is reversed.

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