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3 years ago

Which of the following statements is correct regarding transformers?

Physics

2 answers:

vodomira [7]3 years ago

8 0

Answer:

C. If an alternating current is present in the primary coil, a current will be induced in the secondary coil.

Explanation:

As we know by the principle of induction given by faraday there will be induced EMF in the coil if the magnetic flux linked with the coil will change with time.

$E = -\frac{d\phi}{dt}$

now we know that when alternating current passes through the primary coil then it will change the flux linked with the secondary coil.

Due to change in the flux of secondary coil it will induce the EMF in that coil.

so here correct answer will be

C. If an alternating current is present in the primary coil, a current will be induced in the secondary coil.

MakcuM [25]3 years ago

3 0

Wow ! The wording here seems so complicated that even an
electric current might have a hard time finding its way through
these statements.

if I haven't been tricked by all this complexity, bloviation, and
obfuscation, then Choice-C is the best one.

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a hunter 412.5m from a cliff moves a distance x towards the cliff and fires a gun. he hears the echo from the cliff after 2.2sec

Inessa [10]

Answer: 49.5 m

Explanation:

The speed of sound $s$ is given by a relation between the distance $d$ and the time $t$ :

$s=\frac{d}{t}$ (1)

Where:

$s=330 m/s$ is the speed of sound in air (taking into account this value may vary according to the medium the sound wave travels)

$d=412.5 m-x$ since we are told th hunter was initially 412.5 meters from the cliff and then moves a distance $x$ towards the cliff

$t=\frac{2.2 s}{2}=1.1 s$ Since the time given as data (2.2 s) is the time it takes to the sound wave to travel from the hunter's gun and then go back to the position where the hunter is after being reflected by the cliff

Having this information clarified, let's isolate $d$ and then find $x$ :

$d=st$ (2)

$412.5 m-x=(330 m/s)(1.1 s)$ (3)

Finding $x$ :

$x=49.5 m$ This is the distance at which the hunter is from the cliff.

3 0

3 years ago

A robot is on the surface of Mars. The angle of depression from a camera in the robot to a rock on the surface of Mars is 13.69

ra1l [238]

Answer:

The distance between the camera and the rock is 836.6 cm

Explanation:

A right triangle is formed where the hypotenuse (h) is the distance between the rock and the camera. One of the leg (l) is the distance between the camera and the surface. The angle between the hypotenuse and this leg is α = 90° - 13.69° = 76.31°. By definition:

cos α = adjacent/hypotenuse

cos(76.31) = 198.0/h

h = 198.0/cos(76.31)

h = 836.6 cm

3 0

3 years ago

A friend waves & yells at you. If the sound took 3.20 seconds to reach you and the speed of sound is 340 m/s,

xeze [42]

Answer:

1088 m

Explanation:

3.00 seconds times by 340 =1020+68=1088

5 0

2 years ago

Which optical device can focus light to a point through reflection?

nekit [7.7K]

Answer:

It is A

Explanation:

6 0

2 years ago

How much must a man weigh (force) if the pressure he exerts while standing on one foot which has an area of 25 m^2 exerts a pres

andriy [413]

Answer:

Weight, W = 125 N

Explanation:

Pressure, P = 5 Pa

Area, A = 25 m²

We need to find how much must a man weigh (force) if the pressure he exerts while standing on one foot which has an area of 25 m² exerts a pressure of 5 Pa. So,

Pressure = force/area

So,

$F=P\times A\\\\F=5\times 25\\F=125\ N$

So, the weight of the man is 125 N.

7 0

2 years ago