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3 years ago

2 FULLS

Physics

1 answer:

attashe74 [19]3 years ago

3 0

Answer:

Two vectors not lying in the same line and pointing in different direction

C. Two-dimensional

Explanation:

One-Dimensional vectors will point in a single direction only. There magnitude will simply add up.

In case of opposite directions, both the vectors must be lying on a straight line. There magnitude will be subtracted from each other,

Two dimensional vectors are quantities with magnitude and direction and they are represented by two components, x and y.

So, vectors which are not in a straight line and point in different directions are called Two-dimensional vectors.

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You want to use the idea of electromagnetic induction to make the bulb in your small flashlight glow; it glows when the potentia

makkiz [27]

a) 57.5 m/s

b) Yes

Explanation:

According to Faraday-Newmann-Lenz's law, the electromotive force induced in the coil due to the change in magnetic flux through it is given by:

$\epsilon=-\frac{N \Delta \Phi}{\Delta t}$

where

N is the number of turns in the coil

$\Delta \Phi$ is the change in magnetic flux

$\Delta t$ is the time interval

The change in magnetic flux can be written as

$\Delta \Phi = A\Delta B$

where

A is the area of the coil

$\Delta B$ is the variation of the strength of the magnetic field

Re-writing the equation,

$\epsilon=-\frac{NA\Delta B}{\Delta t}$

To make the bulb glowing, the induced emf must be:

$\epsilon=1.5 V$

And we also have:

N = 100

$\Delta B=0 T-3.6\cdot 10^{-2} T=-0.036 T$

$A=2.9\cdot 10^{-4} m^2$

So we can find the maximum time required to induce this emf:

$\Delta t=-\frac{NA\Delta B}{\epsilon}=-\frac{(100)(2.9\cdot 10^{-4})(-0.036)}{1.5}=6.96\cdot 10^{-4} s$

Since the length to cover in this time is

L = 4.0 cm = 0.04 m

The speed should be

$v=\frac{L}{t}=\frac{0.04}{6.96\cdot 10^{-4}}=57.5 m/s$

Yes: if the coil is moved at a speed of 57.7 m/s, then the potential difference induced in the bulb will be 1.5 V, which is enough to make the bulb glowing.

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Explanation:

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