Question

An electron moving with velocity v along the axis approaches a circular current carrying loop as shown in the figure. The magnitude of magnetic force on electron at this instant is-

• A. $\frac { \mu _ { 0 } } { Z }$ $\frac { \mathrm { eviR } ^ { 2 } \mathrm { X } } { \left( \mathrm { X } ^ { 2 } + \mathrm { R } ^ { 2 } \right) ^ { 3 / 2 } }$
• B. m₀ $\frac { \mathrm { eviR } ^ { 2 } \mathrm { X } } { \left( \mathrm { X } ^ { 2 } + \mathrm { R } ^ { 2 } \right) ^ { 3 / 2 } }$
• C. $\frac { \mu _ { 0 } } { 4 \pi }$ $\frac { \mathrm { eviR } ^ { 2 } \mathrm { X } } { \left( \mathrm { X } ^ { 2 } + \mathrm { R } ^ { 2 } \right) ^ { 3 / 2 } }$
• D. 0

Answer 1

Answer: (D)

0

Answer 2

Direction of electron velocity is along magnetic lines of flux. Hence F = O