I need this asap please

A circular loop in the plane of a paper lies in a 0.45 T magnetic field pointing into the paper. The loop's diameter changes fro

Amanda [17]

Answer:

(A). The direction of the induced current will be clockwise.

(B). The magnitude of the average induced emf 16.87 mV.

(C). The induced current is 6.75 mA.

Explanation:

Given that,

Magnetic field = 0.45 T

The loop's diameter changes from 17.0 cm to 6.0 cm .

Time = 0.53 sec

(A). We need to find the direction of the induced current.

Using Lenz law

If the direction of magnetic field shows into the paper then the direction of the induced current will be clockwise.

(B). We need to calculate the magnetic flux

Using formula of flux

$\phi_{1}=BA\cos\theta$

Put the value into the formula

$\phi_{1}=0.45\times(\pi\times(8.5\times10^{-2})^2)\cos0$

$\phi_{1}=0.01021\ Wb$

We need to calculate the magnetic flux

Using formula of flux

$\phi_{2}=BA\cos\theta$

Put the value into the formula

$\phi_{2}=0.45\times(\pi\times(3\times10^{-2})^2)\cos0$

$\phi_{2}=0.00127\ Wb$

We need to calculate the magnitude of the average induced emf

Using formula of emf

$\epsilon=-N(\dfrac{\Delta \phi}{\Delta t})$

Put the value into t5he formula

$\epsilon=-1\times(\dfrac{0.00127-0.01021}{0.53})$

$\epsilon=0.016867\ V$

$\epsilon=16.87\ mV$

(C). If the coil resistance is 2.5 Ω.

We need to calculate the induced current

Using formula of current

$I=\dfrac{\epsilon}{R}$

Put the value into the formula

$I=\dfrac{0.016867}{2.5}$

$I=0.00675\ A$

$I=6.75\ mA$

Hence, (A). The direction of the induced current will be clockwise.

(B). The magnitude of the average induced emf 16.87 mV.

(C). The induced current is 6.75 mA.

5 0

2 years ago

Plz help

musickatia [10]

The water. Take the specific heat of steel, estimate the volume of the nail, you know the volume of the water, which has a specific heat of one. Or be obvious. If you dropped a red hot nail into a liter of cold water, what would happen?

Answer:

Water

7 0

2 years ago

Read 2 more answers

Sam is moving house and is carrying a 300N box of books up a flight of steps 5m high, it takes her 30 seconds. Gary follows her

hjlf

Answer:

Sam is providing the biggest power i.e. 50 W

Explanation:

Sam is moving house and is carrying a 300N box of books up a flight of steps 5m high, it takes her 30 seconds.

Sam's power :

$P_1=\dfrac{W_1}{t_1}\\\\P_1=\dfrac{F_1d}{t_1}\\\\P_1=\dfrac{300\times 5}{30}\\\\P_1=50\ W$

Gary follows her carrying a bag of clothes doing 1000 J of work; it only takes him 25 seconds.

Gary's power :

$P_2=\dfrac{W_2}{t_2}\\\\P_2=\dfrac{1000}{25}\\\\P_2=40\ W$

So, it is clear that Sam is providing the biggest power.

4 0

2 years ago

How do you Answer this Problem HELP PLEASE

Evgesh-ka [11]

You say to yourself "Self ! Energy can't be created or destroyed.
The skier's kinetic energy at the bottom of the hill is exactly the
potential energy s/he had at the top."

Potential energy at the top = (mass) (gravity) (height)

   = (65.8 kg) (9.8 m/s²) (521 m)

   = (65.8 x 9.8 x 521) kg-m²/s²

   =    335,961.6 joules .

Part-a: No energy is lost on the way down.

Kinetic energy at the bottom = (1/2) (mass) (speed²)

335,961.6 joules = (1/2) (65.8 kg) (speed²)

335,961.6 joules / 32.9 kg = speed²

335,961.6 kg-m²/s² / 32.9 kg = speed²

(335,961.6 / 32.9) m²/s² = speed²

   speed = 101 m/s
___________________________________________

Part b: Energy is lost on the way down.

Just subtract the 1.4 x 10⁵ J of energy away from the 335,961.6 J
before you do the Kinetic Energy calculation at the bottom of the hill.
The skier lost that much energy on the way down, by scraping against
snow and air and stuff, so it isn't available to make speed at the bottom.

6 0

3 years ago

The asthenosphere is a layer whose distinctiveness from the rest of the mantle is based on its ___________.

gavmur [86]

<span>reduced rigidity should be the answer

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8 0

3 years ago

Read 2 more answers