A proton with a charge 1.6 x 10-19 c travels at 2 x10+6 m/s through a uniform magnetic field of 4x10-2 T at a right angle to the field. What is the magnetic force acting on the proton?

Note : 10-2 = 0.01 and F = qvBSino

A. 1.28 x 10-14 N

B. 12.8 x 10-14 N

C. 0.128 x 10-14 N

D. 128 x 10-14 N

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Explanation:

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the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.