MCQs: Charges in a B field

Charges in a B field


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    The earth's magnetic field acts like a magnetic bottle trapping the charged particles coming from the sun, they spiral back and forth along the field lines only getting close to the atmosphere at the poles.


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    Paths have same redius so mass is the same but force is in opposite directions so must have  opposite charge.
    B is positive and A is negative.
     


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    Current opposite to charge movement use Flemmings left hand rule.


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    Current same direction as charge. use Flemmings left hand rule.


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    F = BIL
    I =V/R so F = BVL/R
    R= BVL/F = 0.05 x 6 x 0.03/1x10-3 = 9Ω


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    Because its not next to the angle.


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    F = BIL = 10 x 10-3 x 5 x 0.04 = 0.002


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    Flemings left hand rule.


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    Current is parallel with field.


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    Flemmings Left hand rule.

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