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A charged particle moves with velocity v...

A charged particle moves with velocity `vec v = a hat i + d hat j` in a magnetic field `vec B = A hat i + D hat j.` The force acting on the particle has magnitude F. Then,

A

`F=0`, if `aD=dA`

B

`F=0` if `aD=-dA`

C

`F=0`, if `aA=-dD`

D

`Fprop(a^(2)+b^(2))^(1//2)xx(A^(2)+D^(2))^(1//2)`

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The correct Answer is:
A
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