Answer:
0.23348 A
Explanation:
B = Magnetic field
v = Velocity of electron =
q = Charge of electron =
= Vacuum permeability =
r = Radius of circle = 0.026 m
N = Number of turns = 103 turns/cm =
I = Current
The magnetic and centripetal force will be balanced
The magnetic field in solenoid is given by
From the first equation
The current in the solenoid is 0.23348 A
Answer:
94.13 ft/s
Explanation:
<u>Given:</u>
<u>Assume:</u>
For the motion of the rock along the vertical during the time of flight, the rock has a constant acceleration in the vertically downward direction.
Now the rock has zero acceleration along the horizontal. This means it has a constant velocity along the horizontal during the time of flight.
On dividing equation (1) by (2), we have
Now, putting this value in equation (2), we have
Hence, the initial velocity of the rock must a magnitude of 94.13 ft/s to hit the opponent exactly at 98 yards.