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Questions  

The radius of the circular path or helical path followed by the test charge qo moving in magnetic field B with some velocity v is

a
mvsin⁡θq0B
b
mvcos⁡θq0B
c
mvq0B
d
mvtan⁡θq0B

detailed solution

Correct option is A

The circular motion of charged particle will be due to component of velocity v perpendicular to magnetic field, i.e., v sinθ∴ m(vsin⁡θ)2r=q0(vsin⁡θ)Bor r=m(vsin⁡θ)q0B

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