An alien from a planet in the galaxy M31 (Andromeda) has a ray gun that shoots p

Question

An alien from a planet in the galaxy M31 (Andromeda) has a ray gun that shoots protons at a speed of 2.0 × 105 m/s. Design a magnetic shield that will deflect the protons away from your body.
[no title provided]
Part A
Suppose that the magnetic field has horizontal direction and you want to deflect the beam through a path with radius R = 2.0 m as shown in (Figure 1) . Find the field strength needed to achieve the desired deflection. The mass of a proton is 1.67× 1027 kg and its charge is 1.6× 1019 C.
Express your answer to two significant figures and include the appropriate units.
Part B
What is the direction of the magnetic field in the region defined in (Figure 1) , that would cause the deflection shown for the proton beam?

along the path of the proton beam
toward the center of the curved path
into the page
out of the page

Part C
What is the direction of the magnetic force in the region defined in (Figure 1) , that would cause the deflection shown for the proton beam?
What is the direction of the magnetic force in the region defined in , that would cause the deflection shown for the proton beam?
   toward the center of the curved path
   into the page
   out of the page
   along the path of the proton beam

Explanation / Answer

A) We use:

F = qvB = mv2/R

B = mv/(qR)

using give data we get:

B = 1.04375 * 10-3 T

B) When the proton enters to the magnetic field the force is upward so using the right hand rule the magnitude of the magnetic field must be into the page

C) The direction of the force is:

toward the center of the curved path
this can be get using the right hand rule.

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