An electromagnet is a device in which moving electric charges (current) in a coil of wire create a magnet. What’s one advantage of using electromagnets in devices? A Electromagnets have a strong, constant magnetic field. B Electromagnets are more powerful than permanent magnets. C Electromagnets don’t need a source of electricity to work. D Electromagnets can easily be turned on and off.
Answers
The electromagnet can be adjusted for having different levels of magnetic fields by turning it on and off. Hence, option (D) is correct.
What is an Electromagnet?
Electromagnets are made by winding a wire through a magnetic material such as a soft iron core making a coil and then passing an electric current through the coil thus making the soft iron core magnetic.
The characteristics of electromagnets are as follows -
- The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.
- Permanent or regular magnets on the other hand do not require power but depend on the type of material used to make it.
- It is advantageous to use electromagnets as compared to using permanent magnets since the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils.
Thus, we can conclude that the electromagnet can be adjusted for having different levels of magnetic fields by turning it on and off. Hence, option (D) is correct.
Learn more about the Electromagnets here:
Answer;
D Electromagnets can easily be turned on and off.
Explanation;
- Electromagnets are made by winding a wire through a magnetic material such as soft iron core making a coil, and then passing electric current through the coil thus making the soft iron core magnetic.
- The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.
- Permanent or regular magnets on the other hand do not require power but depends on the type of material used to make it.
- Therefore, its advantageous to use electromagnets as compared to using permanent magnets since the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils. Thus, the electromagnet can be adjusted for have different levels of magnetic fields.
Related Questions
What does work depend on in scientific terms?
A slingshot is used to launch a stone horizontally from the top of a 20.0 meter cliff. The stone lands 36.0 meters away.a. At what speed was the stone launched?b. What is the speed and angle of impact?
This is heat or electrical transfer by contact.
I need to know more about science
Answers
Answer:
81.29 m/s
Explanation:
Given:
60°C = 333 K is cp = 1.007 kJ/kg·K.
at air inlet:
Pressure = 100 kPa
Temperature = 30°C
Velocity = 357 m/s
at air outlet:
Pressure = 200kPa
Temperature = 90°C
We can define the energy balance as:
-
= Δ
= 0
therefore, =
m + m
=m
+
(taking m common and cancelling it)
4 +
=
+
The velocity at the exit of a diffuser:
= [
+ 2
(
-
)
= [
+ 2 x 1000 x 1.007 x (30-90)
= 81.29 m/s
therefore, the velocity at the exit of a diffuser is 81.29 m/s
Answer:
Exit velocity = 498.3m/s
Explanation:
The energy balance for the system is given by:
Ein - Eout = ◇Esystem
Ein = Eout
Therefore
m' (h1 + V1^2/2) = m' (h2 + V2^2/2)
h1 + V1^2/2 = h2 + V2^2/2
The exit velocity will be:
V2 = [V1^2 + 2(h1 - h2)^0.5 = [V1^2 + 2(cp(T1 - T2)]^0.5
But cp = 1.007kJ/kg
V2 = [(357)^2 + 2(1.007)(90-30)(1000m^2/s^2)]^0.5
V2 = [127449 + 120840]^0.5
V2 = [248289]^0.5
V2 = 498.3m/s
Answers
9.40 V
2.40 V
zero
Answers
With the switch open, there's no current in the circuit, and therefore
no voltage drop across any of the dissipative elements (the resistor
or the battery's internal impedance). So the entire battery voltage
appears across the switch, and the voltmeter reads 12.0V .
property of
snowflakes?
A. They are a solid.
B. They are a gas.
C. They are plasma
D. They are a liquid,
Answers
Answer:
A. They are a solid.
Explanation:
Hope this helps. . .
uwu
Answers
Answer:
Adiabatic
Explanation:
b. It remains the same for each trophic level.
c. It increases from one trophic level to another.
Answers
As we move above up from one trophic level to another in an energy pyramid, what happens to the energy?
a. It decreases from one trophic level to another.
b. It remains the same for each trophic level.
c. It increases from one trophic level to another.
As we move above up from one trophic level to another in an energy pyramid, the energy level decreases from one trophic level to another. The answer is letter A.