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3 years ago

Which statement about electromagnet is true

Physics

2 answers:

Snowcat [4.5K]3 years ago

7 0

Answer: It doesn’t function without a source of current

Explanation:

In an electromagnet, the magnetic field is generated by an electric current in a coil of wire which reinforces an iron core. But when the electric current applied on the mentioned core is disconnected, it immediately loses its magnetization. This also means that the intensity of the magnetic field can be controlled (increased or decreased) by changing the intensity of the electric current flowing through the nucleus.

That is why an electromagnet does not work without electric current.

avanturin [10]3 years ago

3 0

Answer:

<h2>It doesn’t function without a source of current.</h2>

Explanation:

An electromagnet is defined as a magnet where its magnetic field is generated by an electrical current.

A simple form of an electromagnet is coil of wire wrapped around an iron core. The iron material helps to intensity the magnetic field.

Additonally, the strength of the magnetic field depends directly on the amount of current.

Therefore, the right answer is the first choice, because an electromagnet won't work without a current.

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4 years ago

A ball is tossed vertically upwards with a speed of 5.0 m s–1. After how many seconds will the ball return to its initial positi

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Answer:

1.02 seconds

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s = Displacement travelled = 0

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Equation of motion

$s=ut+\frac{1}{2}at^2\\\Rightarrow 0=5t+\frac{1}{2}-9.81\times t^2\\\Rightarrow 0=5t-4.905t^2\\\Rightarrow 0=t(5-4.905t)\\\Rightarro 0=5-4.905t\\\Rightarrow t=\frac{-5}{-4.905}=1.02\ seconds$

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4 years ago

Explain how two dangerous elements can form a compound that is edible

blsea [12.9K]

Two dangerous elements can form a compound that is edible known as "NaCl salt".

<u>Explanation:</u>

Sodium and chlorine are two very dangerous elements. As the reaction between sodium and water is extremely violent and chlorine is a very toxic gas. But combination of these elements result into a harmless product with unique properties like it is edible and dissolves without exploding in water.

In sodium chloride reaction the atoms of sodium interact with chlorine atoms. Sodium will donate an electron (by becoming positively charged) to acceptor chlorine (which become negatively charged) as given in following reaction

$N a+C l_{2} \rightarrow N a C l$

As sodium and chlorine are very keen to achieve noble gas configuration by completing an octet on donating and accepting an electron respectively.

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4 years ago