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Question

Write Biot-Savart law.
Write the path of motion of an electron when it enters in magnetic field at
(a) perpendicular
(b) an angle θ.

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Solution

The Biot-Savart Law relates magnetic fields to the currents which are their sources. It is given as
dB=μ04πdl×Ir2
(a) For electron moving perpendicular to magnetic field, the path is circular.
(b) For electron moving angle θ to magnetic field, the path is helical.

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