A doubly ionized helium nucleus (charge = 3.2 × 10-19 enters a region of uniform magnetic field with a velocity (103 m/s)\(\hat{\mathbf{i}}\). The magnetic induction in the region is 20 mT directed towards the positive x-axis. The force on the ion is
A. (6.4 × 10-18 N) \(\hat{\mathrm{j}}\)
B. (6.4 × 10-18 N) \(\hat{\mathrm{k}}\)
C. zero
D. none of these.
Answer:C
A doubly ionized helium nucleus (charge = 3.2 × 10-19 enters a region of uniform magnetic field with a velocity (103 m/s)\(\hat{\mathbf{i}}\). The magnetic induction in the region is 20 mT directed towards the positive x-axis. The force on the ion is
A. (6.4 × 10-18 N) \(\hat{\mathrm{j}}\) B. (6.4 × 10-18 N) \(\hat{\mathrm{k}}\) C. zero D. none of these.