Aditi Chauhan
Last Activity: 11 Years ago
Sol. M base P = 1.6 × 10^–27 Kg
υ = 2 × 105 m/s r = 4 cm = 4 × 10^–2 m
Since the proton is undeflected in the combined magnetic and electric field. Hence force due to both the fields must be same.
i.e. qE = qυB ⇒ E = υB
Won, when the electricfield is stopped, then if forms a circle due to force of magnetic field
We know r = mυ/qB
⇒ 4 * 10^2 = 1.6 *10^-27 *2 * 10^5/1.6 * 10^-19 *B
⇒ B = 1.6 *10^-27 *2 * 10^5/4 * 10^2 * 1.6 *10^-19 = 0.5 * 10^-1 = 0.005 T
E = υB = 2 * 10^5 * 0.05 = 1 * 10^4 N/C