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3 years ago

What is the requirement for a core to be used in an electromagnet?

2 answers:

5 0

<span> The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.</span>

ASHA 777 [7]3 years ago

4 0

Answer: A ferromagnetic material like iron

Explanation:

A ferromagnetic material like iron, cobalt and nickel should be placed as a core in an electromagnet. These materials produce strong magnetic material when magnetic force acts. In an electromagnet, a conducting wire is wrapped around a core usually made of iron. When current flows in the wire, magnetic field is produced. The magnetic field causes the domains in the ferromagnetic materials to align in single direction and produce stronger magnetic field.

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Two spaceships that have different masses but rocket engines of identical force are at rest in space. if they fire their rockets

NISA [10]

Force is calculated F=m×a.
If both ships speed up with the same force, but have a different mass, This means that a also has to be different. If F is the same but ship a has a bigger mass(m) than ship b, then the acceleration(a) of ship b has to be bigger so F of each ship is the same. So the ship with the smaller mass will speed up faster.

5 0

3 years ago

If the ultraviolet photon has a wavelength of 249 nm and one of the photons emitted by the fluorescent material has a wavelength

melamori03 [73]

Answer:

601 nm

Explanation:

Energy of photon having wavelength of λ nm

= $\frac{1244}{\lambda}$ eV

Energy of 249 nm photon

= $\frac{1244}{249}$

=4.996 eV

Similarly energy of 425nm photon

= $\frac{1244}{425}$

=2.927 eV

Difference = 2.069 eV.

This energy will give rise to another photon whose wavelength will be

λ = $\frac{1244}{2.069}$

= 601 nm.

6 0

4 years ago

Which of the following questions could you ask if you wanted to expand on the following piece of data?

antoniya [11.8K]

A B C D is the right answer

4 0

3 years ago

A current flowing through you of more than 5 ma is considered dangerous. Why do we see warnings about high voltage, rather than

svet-max [94.6K]

Answer:

V = 500 volts

I = 50 nA

Explanation:

We usually see 'high voltage' sign rather than 'high current' this is due to the fact that the amount of current depends upon the resistance of the body,

The relation of voltage, current and resistance is given by Ohm's law,

V = IR

I = V/R

As you can see, current and resistance are inversely related, the lower the resistance of the body, the higher will be the current flowing through the body.

What voltages are dangerous even if the skin is dry?

A dry human body has a resistance of approximately 100 kΩ and it gets reduced if the body is wet.

For a current of 5 mA, the corresponding voltage is,

V = 0.005*100,000

V = 500 volts

Therefore, for a dry human body, a voltage of 500 volts would be dangerous.

If voltage differences that are observed are about 0.5 mV, and the resistance of the skin is about 10 kΩ, what size currents are involved?

I = V/R

I = 0.0005/10,000

I = 50×10⁻⁹ A

I = 50 nA

Therefore, a current of 50 nA would be flowing through the EEG.

8 0

3 years ago

You pull a rope to the left with 300n and a friend pulls it the rope to the right with 425n what is the magnitude and direction

eduard

Answer: from vector law opposite we minus

Hence

425n-300n=125n to the right

Hints in left vector have -Ve sign while right have +Ve sign

5 0

3 years ago