Question

Work done on an electron moving in a solenoid along its axis is equal to

Answer 1

Answer:

We know that

$work \: = force \times \: {displacement}$

Now

$force = bilsin \alpha$

Here Alpha is 0 hence Sin0=0 which means work done is 0...

@Anuj❤️

Answer 2

Answer:

Work done on an electron moving in a solenoid along its axis is equal to zero.

Explanation:

• Concept: Solenoid is a coil of wire which acts as an electromagnet when current passes through it.

• Around the solenoid ,a magnetic field is produced.
• The magnetic field within the solenoid is uniform and parallel to the axis of solenoid.  

                               $F_m=$ Magnetic force

                              B= Flux density

                              q=charge

                              v= velocity of charge

                              $F_m=q(V\times B )\\F_m=BqvSin\theta$

Since, angle between  v and  B is zero ,therefore $F_m=0$.

• We know that work, W= F × d cosϕ

Since F=0 ⇒ W=0