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An electric current I flows through a ci...

An electric current I flows through a circular loop as shown in Figure 2(b) below. Write an expression and direction for the magnetic field at the centre of the loop at point P.

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The magnitude of magnetic field at the centre of the loop at point P is: `B= (mu_(0)I)/(2a)`

`mu_(0) rarr` Permeability of free space
`I rarr` current
`a rarr` radius of circular loop
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