Point charges Q1 and Q2 of +12 nC and -12 nC, respectively, are placed 10.0 cm apart . This combination of two charges with equal magnitude and opposite sign is called an electric dipole. Compute the resultant electric field (magnitude and direction) at:point a, midway between the charges Q1 and Q2. point b, 4.0 cm to the left of Q1.

answer; /// i believe that the correct answer is (c)

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:

search it up!

explanation: