I think the small mass Sorry if I’m incorrect
Answer:
The current is
Explanation:
From the question we are told that
The length of the solenoid is
The radius is
The number of turn is
The magnetic field is
The magnetic field produced is mathematically represented as
making the subject
Where is the permeability of free space with values
substituting values
Answer: c
Explanation:Use equation for speed: V=S/t
S=50 km -distance
t=15 min=0.25h -time
V=?
------------------------
V=S/t
V=50km/0.25h
V=200km/h
I think the amount of force will decrease and the amount of work will increase