Donna stretched a spring to increase its length. nearby in an electrical device, a positive charge attracted a negative charge. which statement is true about the spring and the negative charge? they both experienced contact forces. they both experienced non-contact forces. the spring experienced a contact force and the charge experienced a non-contact force. the spring experienced a non-contact force and the charge experienced a contact force.

The spring experienced a contact force and the charge experienced a non-contact force.

If she stopped pulling no contact spring released.

No contact between charge and - charge, not necessarily, at least.

so i believe 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:

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