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3 years ago

What type of device uses an electromagnet to convert electrical energy into mechanical energy?

Physics

2 answers:

irinina [24]3 years ago

6 0

A motor uses an electromagnet to convert electrical energy into mechanical energy.

galben [10]3 years ago

5 0

Answer: The correct answer is "motor".

Explanation:

Electric motor: It is the device which converts the electrical energy into the mechanical energy.

When the current is flowing through the wire then there will be magnetic field around the wire.

Both magnetic field and the electric field are applied in the motor. So, there will be electric force and the magnetic force.

Electricity can be used to move magnet. The electric motor uses electricity in this way. It generates the magnetic field with the electric current flowing through the coil. This magnetic field helps in moving the magnet that runs the motor.

Therefore, motor is a device which uses an electromagnet to convert electrical energy into mechanical energy.

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Answer:

Diameter of wire B is 2 times the diameter of wire A

Explanation:

We have given two wire A and B

They are made up of same material and length of both the wire is sane

So $l_A=l_B$

Let the resistivity of both the wire is $\rho$

It is given that wire A has 4 times the resistance as wire B

So $R_A=4R_B$

So $\frac{\rho l_A}{a_A}=4\frac{\rho l_B}{a_B}$ ( As $l_A=l_B$ )

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2 years ago

A block moves along a table at a constant velocity and then rolls off the edge of the table. The forces that should be included

Alla [95]

Answer:

Gravity

Explanation:

When the ball is falling to the ground, there is only one force- gravity. In some cases, there may be air resistance, but that seems to be neglected here.

Normal force:

Cannot be included. Normal force is only applicable when object is on a surface, and it acts perpendicular to the surface. Since the ball is falling, there is no surface, and therefore no normal force. This question gives you unnecessary information, designed to trick you. Please remember when normal force is applicable.

Friction force:

Also only applicable when object is moving, and is on the table. Friction only applies when there is an applied force. There is no applied force when the ball is falling, so therefore no friction force.

Force of fall:

First of all, what is this? There is nothing called force of fall.

Gravity:

This is the only one that applies. Just draw a vector arrow from the bottom of the ball and label it mg (acceleration due to gravity).

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