Answer:
hope this helps
Explanation:
an object that's less dense than water floats (eg , ball) because the water it displaces weighs more than the object does. If you've ever tried pushing a beach ball underwater , you've felt this principle in action. As we push the ball down , it pushes back up .
Answer:
Luster: Metals are shiny when cut, scratched, or polished.
Malleability: Metals are strong but malleable, which means that they can be easily bent or shaped. ...
Conductivity: Metals are excellent conductors of electricity and heat.
17. a
18. c
19. a
20. c
21. c
The photography that shows a person using a type of wave technology, allows people to see very small objects clearly. D as it is a microscope
<h3>Why are wave technologies important?</h3>
Wave technologies are important because;
- They create waves that are more perfect than humans can provide by themselves.
- Certain inventions use waves to enhance human senses like hearing, sight and touch.
Thus, the photography that shows a person using a type of wave technology, allows people to see very small objects clearly. D as it is a microscope.
Learn more about microscope here:
brainly.com/question/1444040
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Answer:
8 x 10⁻⁷ x I / r
Explanation:
Two parallel long wires are carrying current I . Let the direction be towards the right in the farthest and towards the left in the nearest. Magnetic field due to current I at a distance d is given by the expression
B = μ₀ 2 I / 4π d
I the present case distance d = r/2
Magnetic field due to one wire at point d = r/2 is
B₁ = μ₀ 2 I / (4π r / 2 )
= 10⁻⁷ x 4I / r
Magnetic field due to the other wire at point d = r/2 is
B₂ = μ₀ 2 I / (4π r / 2 )
= 10⁻⁷ x 4I / r
Direction of magnetic field due to both the wires at the mid point P will be same . It will be in downward direction in the given scenario
So total magnetic field
B = B₁ + B₂
= 2 x 10⁻⁷ x 4I / r
= 8 x 10⁻⁷ x I / r
