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  4. In a region of space, a uniform magnetic field B exists in the x-direction. An electron is fired from the origin with its initial velocity u making an angle α with the y direction in the y-z plane. In the subsequent motion of the electron,

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Q. In a region of space, a uniform magnetic field $B$ exists in the $x$-direction. An electron is fired from the origin with its initial velocity $u$ making an angle $\alpha$ with the $y$ direction in the $y-z$ plane. In the subsequent motion of the electron,Physics Question Image

Moving Charges and Magnetism

Solution:

We can see from trajectory that both $y$ - and $z$-coordinates can become negative. This trajectory lies in $y-z$ plane. So, $x$-coordinate is always zero.

Solution Image