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# A charged particle moves with velocity →v=a^i+d^j in a magnetic field →B=A^i+D^j. The force acting on the particle has magnitude F. Then,F=0, if aD=dAF=0, if aD=−dAF∝(a2+b2)1/2×(A2+D2)1/2F=0, if aA=−dD

A
F(a2+b2)1/2×(A2+D2)1/2
B
F=0, if aA=dD
C
F=0, if aD=dA
D
F=0, if aD=dA
Solution
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#### →F=q(→v×→B)

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