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3 years ago

In what way does a temporary magnet provide an advantage over a permanent magnet?

Physics

2 answers:

dimulka [17.4K]3 years ago

6 0

Explanation:

In the electromagnet, the soft iron core is wounded by the coil and the current is passed through it. Then, it will behave like a magnet. When the current is switched off it will loose its magnetism.

Electromagnet is the temporary magnet. The magnetic power of the temporary magnet can be increased or decreased. The strength of the magnetic field depends on the number of turns of the coil and the magnitude of the current.

But in the case of permanent magnet, the magnetic power can not be varied. It is fixed.

Maksim231197 [3]3 years ago

5 0

A temporary magnet allows the user to determine when it is magnetic

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The circuit below contains an ideal battery, four identical light bulbs, and a switch. The switch is initially open.

Dafna1 [17]

The question is incomplete! circuit figure is attached below and answer and explanation is provided below.

Answer:

Bulb_A = Bulb_B = Bulb_D and Bulb_C = 0.

Explanation:

What happens when switch is open?

When the switch is open Bulb_C is open circuited meaning that there is no way for the current to flow through it. This path offers infinite resistance to the current therefore, current will try to take a least resistance path that is through Bulb_B.

So eventually, when the switch is open the circuit becomes a simple series circuit with path From battery to Bulb_A to Bulb_B to Bulb_D to battery with Bulb_C = 0.

What happens in a series circuit?

We know that in a series circuit, there is only one path for the current to flow therefore, same current will flow through all the series Bulbs and their brightness will be same. Bulb_A = Bulb_B = Bulb_D

Brightness in a series circuit:

We also know know that in a series circuit, resistance gets summed up and voltage across each Bulb gets shared which results in less power dissipation that's why Bulbs connected in series appear dimmer as compared to when they are connected in parallel.

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3 years ago

Which of the following statements is true?

Lilit [14]

A. All natural radiation is at a level low enough to be safe

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4 years ago

A high school student ran the 100 meter dash in 12.20 seconds. What was the students. Velocity

sineoko [7]

The student's average speed for the dash was 8.2 m/s. It's not possible to completely describe the student's velocity, because there's no information to tell us what direction she ran.

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4 years ago

A ball is kicked horizontally from a 60 meter tall cliff at 10 m/s. How far from

o-na [289]

Hi there!

We can begin by deriving the equation for how long the ball takes to reach the bottom of the cliff.

$\large\boxed{\Delta d = v_it+ \frac{1}{2}at^2}}$

There is NO initial vertical velocity, so:

$\large\boxed{\Delta d= \frac{1}{2}at^2}}$

Rearrange to solve for time:

$2\Delta d = at^2\\\\t = \sqrt{\frac{2\Delta d}{g}}$

Plug in the given height and acceleration due to gravity (g ≈ 9.8 m/s²)

$t = \sqrt{\frac{2(60)}{(9.8)}} = 3.5 s$

Now, use the following for finding the HORIZONTAL distance using its horizontal velocity:

$\large\boxed{d_x = vt}\\\\d_x = 10(3.5) = \karge\boxed{35 m}$

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3 years ago

Quantum physics would most likely be needed to understand the motion of which of the following?

melisa1 [442]

The correct answer is A.

Quantum physics is the branch of science which deals with the behavior of matter and light on atomic and subatomic level. So, to understand the motion of an atom we would need quantum physics. Motion of a ball and a galaxy can be understood by Newtonian mechanics.

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4 years ago