Magnetic Fields and forces (Bpoints) A proton enters a region of uniform magneti

Question

Magnetic Fields and forces (Bpoints) A proton enters a region of uniform magnetic field as shown in figure 1. At the instant shown, what is the direction of the magnetic force on the proton A) B) C) D) To the left To the right Into the page Out of the page 4) (3 points) A proton is moving at 4.2 x 10 m/s in a region where a uniform magnetic field exists. The magnitude of the field is 0.04 T and it is at a right angle to the velocity. What is the Figure 1 radius of the proton's orbit? A) 0.080 m B) 0.11 m C) 0.14 m D) 0.17 m

Explanation / Answer

3) as the magnetic force is given as

F = q * v X B

as v is upwards

q is positive

mnagnetic field is out of the page

hence , the direction of force on proton is to the right

B) to the right

4)

for the radius

radius = mv/(B * q)

radius = 1.67 *10^-27 * 4.2 *10^5/(1.602 *10^-19 * 0.04)

radius = 0.11 m

the radius is B) 0.11 m

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