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3 years ago

15

Describe how to magnetise a steel using a direct current (d.c) and a coil.

1 answer:

valentina_108 [34]3 years ago

8 0

Answer:

A bar of steel can be magnetised by placing it in a coil of wire (solenoid). Passing a d.c. (direct current) through the wire will magnetise the bar.

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What’s the correct answer

White raven [17]

Looks like you simply substitute the length of the femur

8 0

3 years ago

What do you think is causing the moon to appear to get bigger and smaller?.

7nadin3 [17]

The Moon illusion is the name for this trick our brains play on us. Photographs prove that the Moon is the same width near the horizon as when it's high in the sky, but that's not what we perceive with our eyes. Thus it's an illusion rooted in the way our brains process visual information. Even though we've been observing it for thousands of years, there's still not a satisfying scientific explanation for exactly why we see it.

Hope this helps!
Please give Brainliest!

3 0

2 years ago

Look at the vector r plotted below

solong [7]

Answer: option A. r = 3x+2y

Explanation:

Vector r is plotted on the graph. On x-axis each small division corresponds to 1 unit. Similarly on y-axis, each small division corresponds to one unit.

The vector is the resultant of addition of its x and y components. we would draw perpendicular to the x-axis and y-axis from the head of vector r.

On x-axis, $r_x$ = +3 units

on y-axis, $r_y$ = +2 units

$r = r_x+r_y$

Hence, vector r can be written as: r = 3x + 2y . Correct option is A.

7 0

4 years ago

A ray of light is incident on an air/water interface.

elixir [45]

Answer:

$\theta_2=sin^{-1}(\dfrac{n_1\ sin\theta_1}{n_2})$

Explanation:

Given that,

The ray makes an angle of 32 degrees with respect to the normal of the surface.

The refractive index of air, $n_1=1$

The refractive index of water, $n_2=1.33$

Snell's law is given by :

$n_1\ sin\theta_1=n_2\ sin\theta_2$

$sin\theta_2=\dfrac{n_1\ sin\theta_1}{n_2}$

$\theta_2=sin^{-1}(\dfrac{n_1\ sin\theta_1}{n_2})$

So, option (4) is correct. Hence, this is the required solution.

3 0

3 years ago

Negatively charged particles that orbit the nucleus of an atom are _________. A. electrons B. protons C. neutrons

julsineya [31]

negativily chtarge particles are electron

5 0

4 years ago