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4 years ago

10

A coin is flipped three times resulting in three heads. What is the probability that a fourth flip will be heads? 75% 25% 100% 5

0%

1 answer:

Vinvika [58]4 years ago

4 0

I think it would be 50% because it could land on heads just as much as it lands on tails. its a even chance it could land on whichever it chooses to.

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3 years ago

Which of the following would decrease the strength of an electromagnet? check all that apply

Yakvenalex [24]

<u>Answer</u>:

The correct answer is:

A. straightening the wire, because the number of turns of the wire around the iron core is directly proportional with the strength of electromagnet.

and,

C. decreasing the voltage is correct, by decreasing the voltage, the current will decrease and this leads to weaker electromagnet.

<u>Explanation:</u>

Simply, the electromagnet is used to convert electric energy to magnetic energy.

<u>Basic idea:</u>

The basic idea of the electromagnet is, when the electric current passes through a wire it creates a weak magnetic field

<u>Components of simple electromagnet:</u>

Battery: source of electricity
Electric wire: the electric current passes through it
Iron core: will convert to temporary magnet

<u>The strength of electromagnet is simply defined by the strength of magnetic field that synthesized by the electric current.</u>

<u>Factors affects strength of electromagnet:</u>

<u>Strength of current</u>: by increasing the current that passes through the wire the magnetic field will increase, ( so decreasing the voltage will decrease the current produced and will decrease the strength of electromagnet)

<u>Number of loops or number of turns of the wire</u><u>:</u> the more the number of turns, the more the electric field produced, (so straightening the wire will decrease the magnetic field induced and decrease the strength of electromagnet).

<u>The metal core</u><u>:</u> iron core makes stronger electromagnet.

<u>Decreasing the resistance:</u> this will increase the current produced and will increase strength of electromagnet.

<u>Learn more about:</u>

<u>Factors affects strength of electromagnet:</u> https://brainly.in/question/2672790

<u>Ohm's low: </u>

https://brainly.in/question/1959347

<u>Keywords:</u>

Electromagnet\ electric\ current\ induction\ field \ factors \ strength\ straight\ voltage.

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3 years ago