NEET Class neet Answered
Please answer the following
Asked by ntg432000 | 30 Mar, 2019, 10:03: PM
Expert Answer
Magnetic field B at the centre of arc is obtained by integrating Biot-Savart's law
that is applied to segment legth dl along the length of arc
B = 
at each point of arc length segment dl and unit vector along radial direction are perpendicular.
cross product of vectors equals segment length dl
Hence by keeping all parameters constants, integration of length segment becomes length of arc, i.e. (π/2)r .
Hence Magnetic field B = 
Answered by Thiyagarajan K | 31 Mar, 2019, 10:41: AM
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