Question

An electric feild of 50kV/m is perpendicular to a magnetic field 0.25T. What is the velocity of a charge whose initial of motion is perpendicular to both fields and which passes through the fields undeflected?

3×103
3×103
m/s

2×105
2×105
m/s

4×107
4×107
m/s

5×104
5×104
m/s