Answer:
The force of the floor on the briefcase
Explanation:
The briefcase hits the floor and stops the falling which is reacting to the briefcase that was falling and hits the floor.
The falling briefcase would be the action force because it is moving downward
and
The reaction force would be the floor because it will react on the briefcase.
Hope this Helps
In an electric motor, periodically changing the direction of current in the electromagnet can cause the axle to spin because of the reversing of magnetic field direction.
Explanation
An electric motor consists of a long rod termed as axle which is connected to the electric current.
When the current will be flowing through the axle, a magnetic field will be generated around the axle due to magnetic induction.
The axle is positioned between two strong electromagnets. So when the magnetic field is generated around the axle, depending upon the direction of flow of current, the magnetic field can get attracted or repelled by the electromagnets.
Thus the change in the direction of current flow will lead to reverse in the direction of magnetic field generated around the axle causing it to spin.
Answer:
i don't exactly know but im srry for not giving the right answer
Explanation:
Answer:
Answer:
r=\dfrac{1}{B}\sqrt{\dfrac{2Vm}{e}}r=
B
1
e
2Vm
Explanation:
Let m and e are the mass and charge of an electron. It is accelerated from rest through a potential difference V and are then deflected by a magnetic field that is perpendicular to their velocity. Let v is the velocity of the electron. It can be calculated as :
\dfrac{1}{2}mv^2=eV
2
1
mv
2
=eV
v=\sqrt{\dfrac{2eV}{m}}v=
m
2eV
When the electron enters the magnetic field, the centripetal force is balanced by the magnetic force as :
\dfrac{mv^2}{r}=evB
r
mv
2
=evB
r=\dfrac{mv}{eB}r=
eB
mv
or
r=\dfrac{1}{B}\sqrt{\dfrac{2Vm}{e}}r=
B
1
e
2Vm
So, the radius of the resulting electron trajectory is \dfrac{1}{B}\sqrt{\dfrac{2Vm}{e}}
B
1
e
2Vm
. Hence, this is the required solution.
I don't know the answer it's been awhile since I did this kind of stuff. Sorry.