In which stage of its lifecycle does a silkworm begin to produce silk thread

Here are the stages of a silkworm lifecycle

1. The female lays the eggs

2. A tiny black Caterpillar hatches out of the egg

3. The Caterpillar eats mulberry leaves and grows bigger, it goes through 4 molts.

4. The Caterpillar spins a cocoon of silk threads

5. inside the cocoon the Caterpillar changes into a pupa

6. The pupa changes into a moth, then the moth comes out

7.  The adult moths mate with each other

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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:

no sign of dia of fuel cell