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Q.

Two long thin wires ABC and DEF are arranged as shown in figure. They carry equal currents I as shown. The magnitude of the magnetic field at O is

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a

zero

b

μ0I/4πa

c

μ0I/2πa

d

μ0I/22πa

answer is C.

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Detailed Solution

AB and DE do not give any magnetic field at O.Magnetic field at Odue to BC=μ0i4πaIt is directed 'up'. Magnetic field at O due toEF=μ0i4πa, it is also directed up.  So,  B=μ0i2πa
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