This diagram shows an arrangement to deflect protons from a source to a detector using a magnetic field. The charge on each proton is +e. A uniform magnetic field exists only within the area shown. Protons move from the source to the detector in the plane of the paper.

a i. Copy the diagram and sketch the path of a proton from the source to the detector. Draw an arrow at two points on the path to show the direction of the force on the proton produced by the magnetic field.
ii. State the direction of the magnetic field within the area shown.
b. The speed of a proton as it enters the magnetic field is 4.0 × 10⁶ m s⁻¹. The magnetic flux density is 0.25 T. Calculate:
i. The magnitude of the force on the proton caused by the magnetic field
ii. The radius of curvature of the path of the proton in the magnetic field.
c. Two changes to the magnetic field in the area shown are made. These changes allow an electron with the same speed as the proton to be deflected along the same path as the proton. State the two changes made.

Transcribed Image Text:

source proton region of magnetic field proton detector Figure 25.17