Physics
In the figure given below, current is passed in a downward direction through a cardboard. The magnetic field lines would be :
- straight lines
- concentric circles
- elliptical lines
- squares
Electro-Magnetism
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Answer
concentric circles
Reason — According to the right hand thumb rule, with current passing downward through the cardboard, if we imagine wrapping our right hand around the wire with our fingers pointing downwards, our thumb will point in the direction of the magnetic field lines.
Hence, magnetic field lines would form concentric circles around the wire.
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