(b) We know that, radius of circular path in magnetic field B, r=‌
mv
Bq
When a charge q is accelerated by V volts, it acquires a kinetic energy, Ek=qV l∵‌ Momentum ‌p=√2mEk=√2mqV ⇒‌‌mv=√2mqV From Eq. (i) and (ii), we get cr=√‌