Two protons are projected into different magnetic fields B1 and B2 respectively. The velocity v1 is double the velocity v2. What will be the ratio B2 : B1 if the two radii are equal ?
Answer & explanation
Correct answer: option 1
v1 = 2 v2
v1 : v2 = 2 : 1
r1 = m v1/qB1 ; r2 = m v2/qB2
r1 = r2
v1/B1 = v2/B2
v1/v2 = B1/B2 = 2 : 1