Four different types of light globes were tested for their efficiency. The results are in the table below. Globe numberHeat outputLight output
185%15%
290%10%
350%50%
430%70%

(a)Identify the energy source that was converted to produce light and heat from the globe?



(b)Define the term ‘efficiency’ in relation to this globe test.



(c)Which globe is the most energy efficient? Explain your answer using data from the table.





(d)Describe why is it desirable to have energy-efficient light globes?

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:

yup its correct its: c) b b