Question

Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer).

(i) mass (ii) speed (iii) velocity (iv) momentum

Answer 1

Whenever a charged particle (in this case a proton) moves in a magnetic field, its velocity and as a result of this its momentum change. Thus, (iii) and (iv) are the properties which change when a proton moves freely in a magnetic field.