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  4. An electron moving in a variable magnetic field B, having a variable linear velocity v, will remain rotating in a circle of constant radius r only, when

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Q. An electron moving in a variable magnetic field B, having a variable linear velocity v, will remain rotating in a circle of constant radius r only, when

BVP MedicalBVP Medical 2011

Solution:

The electron moving with linear velocity will remain rotating in a circle of constant radius r in a magnetic field, only when v and B both are held constant.