In the figure,a small particle of charge -1.9 x $10^{ - 6}$ C and mass $m = 3.1 \times 10 ^{- 12} \mathrm {~kg}$ has speed $v _ { 0 } = 8.1 \times 10 ^ { 3 } \mathrm {~m} / \mathrm { s }$ as it enters a region of uniform magnetic field.The particle is initially traveling perpendicular to the magnetic field and is observed to travel in the semicircular path shown with radius R = 5.0 cm.Find the magnitude and direction of the $\vec { B }$ field in the region.

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The Answer of In the figure,a small particle of charge -1.9 x $10^{ - 6}$ C and mass $m = 3.1 \times 10 ^{- 12} \mathrm {~kg}$ has speed $v _ { 0 } = 8.1 \times 10 ^ { 3 } \mathrm {~m} / \mathrm { s }$ as it enters a region of uniform magnetic field.The particle is initially traveling perpendicular to the magnetic field and is observed to travel in the semicircular path shown with radius R = 5.0 cm.Find the magnitude and direction of the $\vec { B }$ field in the region.

In the Figure,a Small Particle of Charge -1 10−610^{ - 6}10−6

In the Figure,a Small Particle of Charge -1 $10^{ - 6}$