An electron moving with a speed of 8.4 105 m/s in the positive z direction experiences zero magnetic force. When it moves in the positive x direction it experiences a force of 2.1 10-13 N that points in the negative y direction. What is the magnitude and direction of the magnetic field?
magnitude T

magnitude of the magnetic field must be 1.56 T

Explanation:

As we know that the magnetic force on moving charge is given as

now when charge is moving along z direction then magnetic force is ZERO

so here we can say that magnetic field must be parallel to velocity of the charge i.e. along z direction

now when charge is moving along x direction then we have

so we have

magnitude of the magnetic field must be 1.56 T

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