The suns energy reaches the sun by
conduction
convection
radiation
fusion

Radiation

Explanation:

Radiation.

It is by Radiation.

Conduction of heat is the process by which heat energy is transferred through a material, the average position of the particles of the material remaining the same. eg cloth, cork, wood etc.

Convection is the process by which heat is transferred in a liquid or gas by the actual movement of the heated fluid from the hotter to the colder parts.

Radiation is the process by which heat is transferred from a hotter to a cooler place with heating of the intervening medium.

Fusion(melting) is the process whereby a substance changes from solid state to a liquid state when heat is applied to it.

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:

c) up is the direction the magnetic force is acting on the charge.