Magnetic force on a moving charge or a wire using the cross product with a vector field

1. A.
   $\frac{LB_{0}}{2}$
2. B.
   $\ {LB}_{o}$
3. C.
   $\ 2{LB}_{0}$
4. D.
   $\ \sqrt{2}ILB$

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1. A.
   $qa\sqrt{b^{2} + c^{2}}$
2. B.
   $qa(b + c)$
3. C.
   $qa\sqrt{b^{2} - c^{2}}$
4. D.
   zero

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1. A.
   $\sqrt{8}$ ILB
2. B.
   $2$ ILB
3. C.
   $4$ ILB
4. D.
   $\sqrt{2}$ ILB

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