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प्रश्न
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.
उत्तर
`because` The current is in anticlockwise direction, therefore magnetic field created is given by right hand thumb rule.
Here, the magnetic field created ic out of the plane of paper
`B = (mu_0I)/(2a)`
where a = radius of the coil.
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