The following four cases show a positive charge moving into a magnetic field \(\vec{B}\) with velocity \(\vec{v}\). In which of the cases are the forces opposite in direction?
A. (iii) and (iv)
B. (i) and (ii)
C. (i) and (iii)
D. (ii) and (iv)
Answer:B
The following four cases show a positive charge moving into a magnetic field \(\vec{B}\) with velocity \(\vec{v}\). In which of the cases are the forces opposite in direction?
A. (iii) and (iv) B. (i) and (ii) C. (i) and (iii) D. (ii) and (iv)