Question

is there anyone who can solve this

Answer 1

The centripetal force (mv²/a) which acts inward balances the Magnetic force (acts outward) evB₀, where B₀ is the Magnetic field

→ mv²/a = evB₀

→ mv = eB₀a

Multiply with 'a' on both sides,

→ mva = eB₀a²

Here 'mva' denotes the Angular momentum.

Therefore the Angular momentum = eB₀a²

Hope it helps!!