(II) A straight stream of protons passes a given point in space at a rate of 2.5 × 10 9 protons/s. What magnetic field do they produce 2.0 m from the beam? The stream of proton constitutes a current, whose magnitude is found by multiplying the proton rate times the charge of proton. Then use Eq. 28-1 to calculate the magnetic field. B stream = μ 0 I 2 π r = ( 4 π × 10 − 7 T ⋅ m/A ) ( 2.5 × 10 9 protons/s ) ( 1.60 × 10 − 19 C/proton ) 2 π ( 2.0 m ) = 4.0 × 10 − 17 T
(II) A straight stream of protons passes a given point in space at a rate of 2.5 × 10 9 protons/s. What magnetic field do they produce 2.0 m from the beam? The stream of proton constitutes a current, whose magnitude is found by multiplying the proton rate times the charge of proton. Then use Eq. 28-1 to calculate the magnetic field. B stream = μ 0 I 2 π r = ( 4 π × 10 − 7 T ⋅ m/A ) ( 2.5 × 10 9 protons/s ) ( 1.60 × 10 − 19 C/proton ) 2 π ( 2.0 m ) = 4.0 × 10 − 17 T
(II) A straight stream of protons passes a given point in space at a rate of 2.5 × 109 protons/s. What magnetic field do they produce 2.0 m from the beam?
The stream of proton constitutes a current, whose magnitude is found by multiplying the proton rate times the charge of proton. Then use Eq. 28-1 to calculate the magnetic field.
B
stream
=
μ
0
I
2
π
r
=
(
4
π
×
10
−
7
T
⋅
m/A
)
(
2.5
×
10
9
protons/s
)
(
1.60
×
10
−
19
C/proton
)
2
π
(
2.0
m
)
=
4.0
×
10
−
17
T
With a magnetic field strength of 3.00•10-4 T and an accelerating voltage of 21.0 V, an electron beam is observed to follow a circular path with a radius 5.00 cm.
From these values, determine the ratio e/me. Give answer in C/kg to three significant figures.
Alpha particles of charge q = 2e and mass m = 6.6 x 10-27 kg are emitted from a radioactive source at a speed of 1.6 x 107 m/s. What magnetic field would be required to bend them into a circular path of 0.25 m radius?
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