solve it 5) A proton has a speed of 3.0a10 6 m/s in a direction perpendicular to
ID: 1397339 • Letter: S
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solve it 5) A proton has a speed of 3.0a10 6 m/s in a direction perpendicular to a uniform magnetic field, and moves in a circle of radius 0.20 m. What is the magnitude of the magnetic field? A) 0.24 T B) 0.36 T C) 0.32 T D) 0.16 T E) 0.080 T 26) A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength is doubled? A) It will become eight times as large. B) It will become four times as large. C) It will be cut in half. D) It will be cut to one-quarter its original size. E) It will double. 27) A straight wire 0.200 m long, carrying a current of 4.0 A, is in a uniform magnetic field of 1.20 T. What is the force on the wire when it is at an angle of 38.7° with respect to the field? A) 0.48 N B) 0.24 N C) 0.60 N D) 0.50 N E) 0.30 N sYou want to obtain a magnification of -2 from a concave m )You want to obtain a magnification of -2 from a concave mirror of focal length f/ The only possible solution is to A) place a virtual object at a distance 5f/3 from the mirror B) place a virtual object at a distance 3f12 from the mirror C) place a real object at a distance 2f/3 from the mirror D) place a real object at a distance 3f/2 from the mirror E) place a virtual object at a distance 2f13 from the mirror ) What is the wavelength of the photon emitted when an electron in a singly ionized helium atom (Z = 2) which is in the initial state ni-8 jumps to the final state ni-47 A) 1 45.7 nnm B) 486.2 nm C) 363.5 nm D) 1 093. nm E) 609.1 n ) At what speed, relative to the frame of the observer making the measurement, is the measured E) 0.80c mass equal to 1.67 the rest mass? B) 0.64c A) 0.40c C) 0.70c D) 0.90cExplanation / Answer
5.
r =radius = 0.20 m
q = charge on proton = 1.6 x 10-19 C
V = speed of proton = 3 x 106 m/s
m = mass of proton = 1.67 x 10-27 kg
using the formula
r = mv/qB
B = mv/qr
B = (1.67 x 10-27) (3 x 106) / ((1.6 x 10-19) (0.2))
B = 0.157 T
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