A physicist performing a sensitive measurement ants to limit the magnetic force

Question

A physicist performing a sensitive measurement ants to limit the magnetic force on a moving charge in her equipment to less than 1.28 times 10^-12 N. What is the greatest the charge can be (in C) if it moves at a maximum speed of 40.0 m/s in the Earth's field? (Assume the maximum magnetic field in the vicinity is 5.00 times 10^-5 T.) C b) Discuss whether would be difficult to limit the charge to less than the value found in a) by comparing it with typical static electricity and noting that static electricity is often present.

Explanation / Answer

Magnetic force

F = B v q

1.28 * 10-12 =q * 40 * 5 * 10-5

q = 0.64* 10-15 C

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