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Experimental set-up
- Set up the circuit shown in figure again.
- Move the key to ‘ON’ position and watch carefully in which direction the compass needle gets deflected.
- Switch ‘OFF’ the current.
- Now keeping rest of the circuit intact, reverse the connections at the terminal of the cell.
- Again switch ‘on’ the current.
- Note the direction in which the needle gets deflected.
Think of an explanation.
When the direction of current is reversed, the will also get reversed. Thus, the compass needle in the direction.
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