المسافرة
24-02-2007, 16:23
السلام عليكم
أحبتي منتدى الكهربية
لدي بعض الأسئلة في الكربية الله يخليكم
ساعدوني في حلها
. An electron has a velocity of 6.0 106 m/s in the positive x direction at a point where the magnetic field has the components Bx = 3.0 T, By = 1.5 T and Bz = 2.0 T. What is the magnitude of the acceleration of the electron at this point?
a. 2.1 1018 m/s2 b. 1.6 1018 m/s2 c. 2.6 1018 m/s2
d. 3.2 1018 m/s2 e. 3.7 1018 m/s2
33. One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
a. 4.0 µT b. 5.0 µT c. 3.0 µT d. 7.0 µT e. 1.0 µT
34. A coil is wrapped with 300 turns of wire on the perimeter of a circular frame (radius = 8.0 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is turned on perpendicular to the plane of the coil. This field changes at a constant rate from 20 to 80 mT in a time of 20 ms. What is the magnitude of the induced emf in the coil at the instant the magnetic field has a magnitude of 50 mT?
a. 24 V b. 18 V c. 15 V d. 10 V e. 30 V
35. A current may be induced in a coil by
a. Moving one end of a bar magnet through the coil.
b. Moving the coil toward one end of the bar magnet.
c. Holding the coil near a second coil while the electric current in the second coil is increasing.
d. All of the above.
e. None of the above.
36. What is the inductance of a series RL circuit in which R = 1.0 K if the current increases to one-third of its final value in 30 µs?
a. 74 mH b. 99 mH c. 49 mH d. 62 mH e. None of the above
أحبتي منتدى الكهربية
لدي بعض الأسئلة في الكربية الله يخليكم
ساعدوني في حلها
. An electron has a velocity of 6.0 106 m/s in the positive x direction at a point where the magnetic field has the components Bx = 3.0 T, By = 1.5 T and Bz = 2.0 T. What is the magnitude of the acceleration of the electron at this point?
a. 2.1 1018 m/s2 b. 1.6 1018 m/s2 c. 2.6 1018 m/s2
d. 3.2 1018 m/s2 e. 3.7 1018 m/s2
33. One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
a. 4.0 µT b. 5.0 µT c. 3.0 µT d. 7.0 µT e. 1.0 µT
34. A coil is wrapped with 300 turns of wire on the perimeter of a circular frame (radius = 8.0 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is turned on perpendicular to the plane of the coil. This field changes at a constant rate from 20 to 80 mT in a time of 20 ms. What is the magnitude of the induced emf in the coil at the instant the magnetic field has a magnitude of 50 mT?
a. 24 V b. 18 V c. 15 V d. 10 V e. 30 V
35. A current may be induced in a coil by
a. Moving one end of a bar magnet through the coil.
b. Moving the coil toward one end of the bar magnet.
c. Holding the coil near a second coil while the electric current in the second coil is increasing.
d. All of the above.
e. None of the above.
36. What is the inductance of a series RL circuit in which R = 1.0 K if the current increases to one-third of its final value in 30 µs?
a. 74 mH b. 99 mH c. 49 mH d. 62 mH e. None of the above