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2 years ago

Which of the following is true about Electromagnets?

Physics

1 answer:

babunello [35]2 years ago

6 0

Answer:

A. When the current is shut off, the magnetic field disappears.

Explanation:

Electromagnetism is a method in which magnetism is obtained from an electric current. It is an artificial way of producing a strong magnetic fields due to the flow of current.

Since the magnetic effect observed is due to the flow of an electric current, so when the current is shut off, the magnetic field disappears.

It has a wide range of applications in manufacturing industries, electric bells, induction coil etc.

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A person drives 70 km/h in 1 hour to the east, then 80 km/h for another hour to the east. What

andre [41]

Answer: The average velocity is 150 km/h

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3 years ago

a spherical mirror is cut in half horizontally will an image be formed by the bottom half of the mirror how

monitta

Answer:

Explanation:

the spherical mirror can form an image even if it is cut in half horizontally , but the image formed may be blurred.

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3 years ago

A 0.18-kg turntable of radius 0.32 m spins about a vertical axis through its center. A constant rotational acceleration causes t

borishaifa [10]

Answer:

Angular acceleration will be $18.84rad/sec^2$

Explanation:

We have given that mass m = 0.18 kg

Radius r = 0.32 m

Initial angular velocity $\omega _i=0rev/sec$

And final angular velocity $\omega _f=24rev/sec$

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From equation of motion

We know that $\omega _f=\omega _i+\alpha t$

$24=0+\alpha \times 8$

$\alpha =3rev/sec^2=3\times 2\times \pi rad/sec^2=18.84rad/sec^2$

So angular acceleration will be $18.84rad/sec^2$

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3 years ago

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Answer:

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