2. A 5 g bullet has been fired along west with 500m/s. It gains 20 electrons whi
ID: 1268448 • Letter: 2
Question
2. A 5 g bullet has been fired along west with 500m/s. It gains 20 electrons while passes through the uniform magnetic field of 0.05mT region acting along North. How much magnetic force the bullet would experience?
3. A long straight vertical wire carries an upward current of I1 = 10 A. A rectangular coil of wire is located near the vertical wire as shown in the figure at right. If a = 10 cm, b = 30 cm, c = 50 cm, and I2 = 5 A, what is the net force on the rectangular coil due to the magnetic field of the straight line?
Explanation / Answer
Number 1)
Apply F = qvB
F = (20)(1.6 X 10-19)(500)(.05 X 10-3)
F = 8 X 10-20 N
Number 2)
Only the parallel portions of the loop factor in. The formula that applies is
F = uIIL/2pir for the two sides of the loop
F = (4pi X 10-7)(10)(5)(.5)/2pi(.1) - (4pi X 10-7)(10)(5)(.5)/2pi(.4)
F = 3.75 X 10-5 N away from the wire
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