The magnetic field of the earth at a certain location isdirected vertically down

Question

The magnetic field of the earth at a certain location isdirected vertically downward and has a magnitude of 50.0 µT. Aproton is moving horizontally toward the west in this field with aspeed of 5.50 x106 m/s. What are the direction andmagnitude of the magnetic force the field exerts on the proton?
1 N
2---Direction---toward the easttoward the westtoward the northtoward the south. choose from: toward the east, west, north, south The magnetic field of the earth at a certain location isdirected vertically downward and has a magnitude of 50.0 µT. Aproton is moving horizontally toward the west in this field with aspeed of 5.50 x106 m/s. What are the direction andmagnitude of the magnetic force the field exerts on the proton?
1 N
2---Direction---toward the easttoward the westtoward the northtoward the south. choose from: toward the east, west, north, south

Explanation / Answer

MAGNETIC FIELD B = 50 * 10 ^ -6 T speed v = 5.5 * 10 ^ 6 m / s charge of proton q = 1.6 * 10 ^ -19 C So, force F = Bvq                  = 440 * 10 ^ -19 N south direction

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