The correct option is B Trajectory of electron is less curved
When a charged particle enters a magnetic field perpendicularly, it
moves on a circular path. The required centripetal force is provided by
the magnetic force.
i.e., Magnetic force = Centripetal force
⇒qvB=mv2r ....(i)
Now, kinetic energy of the particle
k=12mv2
⇒mv=√2mk
Therefore, equation (i) becomes
r=√2mkqB⇒rerp=√memp
As, me<mp; so, re<rp
Hence, trajectory of electron is less curved.