Answer:
[tex]v = 4.78 \times {10}^{6} m {s}^{ - 1} [/tex]
Explanation:
Since the electrons are undeflected,
Magnetic force = Electric force
evB = eE
v = E/B
[tex]v = \frac{1.4 \times {10}^{4} }{2.93 \times {10}^{ - 3} } \\ = 4.78 \times {10}^{6} m {s}^{ - 1} [/tex]
