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cmarton30140
08.04.2020 •
Physics
An electron is accelerated from rest by an electric field. After the acceleration, the electron is injected into a uniform magnetic field of 1.27 times 10-3 T. The velocity of the electron and the magnetic field lines are perpendicular to one another. The electron remains in the magnetic field for 5.13 times 10-9 seconds. The angle (in radians) between the initial electron velocity and the final electron velocity is .
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Ответ:
Explanation: the electron will move uniformly in circular path in magnetic field .
Let B be magnetic field , r be radius of circular path , v and ω be linear and angular velocity of electron , q and m be charge on electron and mass of electron
centripetal force = magnetic force on electron
mω²r = B q v
mω² = B q (v / r)
mω² = B q ω
ω = B ( q / m )
= 1.27 x 10⁻³ x( 1.6 x 10⁻¹⁹ / 9.1 x 10⁻³¹ )
= .2233 x 10⁹ rad / s
angle of rotation by electrons
= angular velocity x time
= .2233 x 10⁹ x 5.13 x 10⁻⁹
= 1.145 radian .
Ответ:
9.9 m
Explanation:
From the question given above, the following data were obtained:
Force (F) = 40 N
Workdone (Wd) = 395 J
Height (h) =?
The height can be obtained as follow:
Potential energy = mgh = Fh
395 = 40 × h
Divide both side by 40
h = 395 / 40
h = 9.9 m
Thus, the height is 9.9 m.