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2 years ago

What is the term for producing a current by changing a magnetic field?

Physics

2 answers:

zvonat [6]2 years ago

8 0

Answer:

Option (c)

Explanation:

Magnetic flux is defined as the number of magnetic field lines passing through any area.

Magnetic flux = B.A

Where B is the strength of magnetic field and A be the area through which the flux is passing.

When a magnetic flux linked with a coil changes, an electric emf is induced in the coil and hence an electric current is also induced. This phenomenon is called electromagnetic induction.

Allushta [10]2 years ago

4 0

c.magnetic induction hope this helps

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Frame S' passes frame S in the usual way (positive directions). An object also moves in the positive direction. Which is true? T

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The answer is "The object's speed relative to S can be greater than or less than its speed relative to S', depending on the actual values."

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An unruly student with a spitwad (a lump of wet paper) of mass 20 g in his pocket finds himself in the school library where ther

jeka94

Answer:

T = 188.5 s, correct is C

Explanation:

This problem must be worked on using conservation of angular momentum. We define the system as formed by the fan and the paper, as the system is isolated, the moment is conserved

initial instant. Before the crash

L₀ = r m v₀ + I₀ w₀

the angular speed of the fan is zero w₀ = 0

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L_f = I₀ w + m r v

L₀ = L_f

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v = r w

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m r v₀ = I₀ v / r + m r v

m r v₀ = (I₀ / r + mr) v

v = $\frac{m}{\frac{I_o}{r} +mr} \ r v_o$

let's calculate

v = $\frac{0.020}{\frac{1.4}{0.6 } + 0.020 \ 0.6 } \ 0.6 \ 4$

v = $\frac{0.020}{2.345} \ 2.4$

v = 0.02 m / s

To calculate the time of a complete revolution we can use the kinematics relations of uniform motion

v = x / T

T = x / v

the distance of a circle with radius r = 0.6 m

x = 2π r

we substitute

T = 2π r / v

let's calculate

T = 2π 0.6/0.02

T = 188.5 s

reduce

t = 188.5 s ( 1 min/60 s) = 3.13 min

correct is C

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