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  2. A squre loop of side 2 a and carrying current I is kept in plane with its centre at origin. A long wire carrying the same current I is placed parallel to z-axis and passing through
# Engineering

A squre loop of side 2 a and carrying current I is kept in xz plane with its centre at origin. A long wire carrying the same current I is placed parallel to z-axis and passing through point (0,b,0), (b>>a). The magnitude of torque on the loop about z-axis will be:  
Option: 1 \frac{2\mu _{0}I^{2}a^{2}}{\pi b}
 
Option: 2 \frac{2\mu _{0}I^{2}a^{2}b}{\pi (a^{2}+b^{2})}
Option: 3 \frac{\mu _{0}I^{2}a^{2}b}{2\pi (a^{2}+b^{2})}  
Option: 4 \frac{\mu _{0}I^{2}a^{2}}{2\pi b}

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