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