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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