currents enters and leaves from points X and Y

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In the following hexagons made up two different material P and Q , currents enters and leaves from points X and Y, respectively. In which cases the magnetic field at its centre is zero ?
17
Oct
In the following hexagons made up two different material P and Q , currents enters and leaves from points X and Y, respectively. In which cases the magnetic field at its centre is zero ? currents enters and leaves from points X and Y In the following hexagons made up two different material P and [...]
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