As shown in Figure Q1, two magnetic fields exist in the regions enclos

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As shown in Figure Q1, two magnetic fields exist in the regions enclosed by three boundaries, l1, l2, and l3. Uniform magnetic field B1 = 2×10−6 T is directed out the page. Uniform magnetic field B2 is directed into the page. The value of B2 is unknown. Then, a proton has a mass equal to 1.67×10−27 kg, has a charge of 1.6×10−19 C, and moves into B1 from point A. The velocity of the proton is vertically upward. The blue dotted line is the trajectory of the proton, which is composed of two quarter circles. The distance between l1 and l2 is d = 5 m. The distance from point A to l3 is dA = 2 m. (1) Find the initial speed v0 of the proton. (2) Find the magnitude of the magnetic field B2. Figure Q1.

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As shown in Figure Q1, two magnetic fields exist in the regions enclosed by three boundaries,

l_{1}, l_{2}

, and

l_{3}

. Uniform magnetic field

B 1 = 2 \times 10^{- 6} T

is directed out the page. Uniform magnetic field

B 2

is directed into the page. The value of

B 2

is unknown. Then, a proton has a mass equal to

1.67 \times 10^{- 27} k g

, has a charge of

1.6 \times 10^{- 19} C

, and moves into

B 1

from point

A

. The velocity of the proton is vertically upward. The blue dotted line is the trajectory of the proton, which is composed of two quarter circles. The distance between