What type of event is required for an action potential to be generated?

When the different ions cross the  neuron membrane due to this  an action potential  generated

Explanation:

When the different ions cross the  neuron membrane due to this  an action potential  generated.

The steps for action potential

1. Depolarization .When positively charge sodium ions enters in to the nerve cell.This is also known as upswing.

2. Repolarization

3. Refractory Phase

So the answer is "When the different ions cross the  neuron membrane".

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:

less than one you can't create energy