A charged particle begins to move from the origin in a region which has a uniform magnetic field in the x-direction and a uniform electric field in the y-direction. Its speed is v when it reaches the point (x, y, z). Then, v will depend

Options

A. only on `x`
B. only on `y`
C. on both `x` and `y` but not `z`
D. on `x, y` and `z`

Answer

B

Explanation

`W_(1 rarr 2) = Delta K`
`qEy = (1)/(2)mv^(2) - 0 rArr v = sqrt((2qEy)/(m))`
`v = fn(y)`