Apoint charge of -7 mu or micro cc is located at x = 4 m, y = -2 m. a second point charge of 12 mu or micro cc is located at x = 1 m, y = 2 m. show steps, you!
(a) find the magnitude and direction of the electric field at x = -1 m, y = 0 (n/c) and the angle (degrees) (counterclockwise from plus x axis).
(b) calculate the magnitude and direction of the force on an electron at x = -1 m, y = 0. (n) and the angle (degrees) (counterclockwise from plus x axis).

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: