Answer:
a) Energy density of the magnetic field, u = 183.46 J/m³
b) Total energy, E = 0.167 J
Explanation:
a) Number of turns in the solenoid, N = 1410
Area, A = 13.8 cm² = 0.00138 m²
Current, I = 8.01 A
Length of the solenoid, l = 66.1 cm = 0.661 m
Energy density, u is given by the formula
Where B is the magnetic field
The magnetic field in a solenoid is given by the formula,
T
b) The total energy = Energy density * Volume
E = u V
Volume = Area * Length
V = Al = 0.00138 * 0.661
V = 0.00091218 m³
E = 183.46 * 0.00091218
E = 0.167 J
Answer:
reproduction
Explanation:
A living thing is characterized by its ability to perform certain functions including growth, irritability, reproduction, respiration etc. Of all these characteristics, REPRODUCTION is key to the survival of an organism's species.
An individual organism will definitely survive without reproducing i.e it will continue living and undergoing its day-to-day activities. However, in order to ensure that its species amongst others survive and not be EXTINCT, it has to reproduce. Reproduction gives rise to more of the same species of organism to form a POPULATION.
Answer
Correct Answer is B(to change direct current into alternating current)
Explanation
commutation
The main aim of commutation is to maintain the torque acting on armature of DC motros in the same direction.
commutator a switch which is used to convert the direction of flow of electric current it is connected to the armature of DC motor.
In DC motors, voltage across the armature is alternating in nature. The direction of this current is reverses by Commutator when armature of DC motors passes through magnetic neutral axis to maintain the unidirectional. Hence, commutator is used to change direct current into alternating current.
Your hypothesis can be that the group with calculators would finish faster than the group without calculators.