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4 years ago

Which can be used to determine if an electromagnet is working? A. compass B. a permanent magnet C. a switch D. galvanometer

Physics

1 answer:

Elena-2011 [213]4 years ago

6 0

The device used to datermine a electromagnet is a /compass

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The armature windings of a dc motor have a resistance of 3.0 Î©. The motor is connected to a 120V line, and when the motor reach

svlad2 [7]

Answer:

0.6 A

Explanation:

As the motor gears towards full speed, the voltage of the circuit tends to become the difference that exists between the line voltage and the that of the back emf. Remembering Ohm's law, we then apply it to get the final, lower current that is based on the reduced voltage Ef. We use the provided resistance in the question, that is 3 ohms.

Ef = (120 V) - (117 V) = 3 V

If = Ef/R = (3 V) / (5.0 Ω) = 0.6 A

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3 years ago

PLEASE HELP WITH THESE WILL GIVE BRAINLEIST

Sedaia [141]

Answer: type of force is friction

Explanation:

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3 years ago

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Electric energy is generated at a nuclear power plant using which type of nuclear reaction?

stellarik [79]

Answer:

A. A nucleus splitting to form two or more smaller nuclei

Explanation:

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3 years ago

Spheres of Charge: A metal sphere of radius 10 cm carries an excess charge of +2.0 μC. What is the magnitude of the electric fie

nadezda [96]

To solve this problem we will apply the concept related to the electric field. The magnitude of each electric force with which a pair of determined charges at rest interacts has a relationship directly proportional to the product of the magnitude of both, but inversely proportional to the square of the segment that exists between them. Mathematically can be expressed as,

$E = \frac{kV}{r^2}$

Here,

k = Coulomb's constant

V = Voltage

r = Distance

Replacing we have

$E = \frac{(9*10^9)(2*10^{-6})}{((10+5)*10^{-2})^2}$

$E = 8*10^5N/C$

Therefore the magnitude of the electric field is $8*10^5N/C$

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3 years ago

Specialized intermodal tank container which carries refrigerated liquid gases, oxygen, or helium

Nookie1986 [14]

This would be a cryogenic intermodal tank. These are used to store and transport HAZMAT gases that require storage under specific pressure and temperature parameters. Cryogenic Intermodal tanks have pressure of 25 Psi or less.

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3 years ago