NEET 2020 Model Question Paper 1

Tire magnetic field at point P due to current I in AB is,
BAB=

µ0I

4πr

⊗
The magnetic field at point P due to current I in BC is,
BBC=0 (As the point P is along the BC) The magnetic field at point P due to current I in A'B' is
BA′B′=

µ0I

4πr

⊗
The magnetic field at point P due to current I in B'C' is,
BB′C′=0 (As the point P is along the BC)
∴ The net magnetic field at P is,
B=BAB+BBC+BA′B′+BB′C′
=

µ0I

4πr

+0+

µ0I

4πr

+0
=2(

µ0I

4πr

) =

µ0

4π

(

2I

r

)