An electron beam moving with a speed of 2.5×107ms−1 enters into the magnetic field directed perpendicular to its direction of motion. The magnetic induction of the field is 4×10−3wb/m2. What is the intensity of the electric field applied so that the electron remains undeflected due to the magnetic field ?
Answer & explanation
Correct answer: option 2
E = vB
v = 2.5×107ms−1 ; B = 4×10−3wb/m2
E = 105 N/C