Which statement is a characteristic of a convex lens?

A flat loop of wire consisting of a single turn of cross-sectional area 8.20 cm2 is perpendicular to a magnetic field that incre

olga nikolaevna [1]

Answer:

The induced current is $I = 6.25*10^{-4} \ A$

Explanation:

From the question we are told that

The number of turns is $N = 1$

The cross-sectional area is $A = 8.20 cm^2 = 8.20 * 10^{-4} \ m^2$

The initial magnetic field is $B_i = 0.500 \ T$

The magnetic field at time = 1.02 s is $B_t = 2.60 \ T$

The resistance is $R = 2.70\ \Omega$

The induced emf is mathematically represented as

$\epsilon = - N * \frac{ d\phi }{dt}$

The negative sign tells us that the induced emf is moving opposite to the change in magnetic flux

Here $d\phi$ is the change in magnetic flux which is mathematically represented as

$d \phi = dB * A$

Where dB is the change in magnetic field which is mathematically represented as

$dB = B_t - B_i$

substituting values

$dB = 2.60 - 0.500$

$dB = 2.1 \ T$

Thus

$d \phi = 2.1 * 8.20 *10^{-4}$

$d \phi = 1.722*10^{-3} \ weber$

So

$|\epsilon| = 1 * \frac{ 1.722*10^{-3}}{1.02}$

$|\epsilon| = 1.69 *10^{-3} \ V$

The induced current i mathematically represented as

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

substituting values

$I = \frac{1.69*10^{-3}}{ 2.70 }$

$I = 6.25*10^{-4} \ A$

7 0

4 years ago

I need help find how much tension is in the string????

Nikitich [7]

Answer:

When a rope supports the weight of an object that is at rest, the tension in the rope is equal to the weight of the object: T = mg.

Image result for I need help find how much tension is in the string???? And can you explain how you got it after you get the answer plz????

Hence, in such a case the tension will be equal to the centrifugal force.

Formula for tension = centrifugal force = mv2/r.

So the formula of tension will be = centripetal force – force of gravity = mv2/r – mg = m(v2/r-g)

The formula of tension will be = centripetal force + force of gravity = mv2/r + mg = m(v2/r+g)

Explanation:

5 0

3 years ago

Why does a heated mirror not become misty and stays clear

Elena L [17]

A mirror only mists because the air is hot and the mirror is cold and if it is heated than the steam wont make the mirror become misty....
hope this helps :D

7 0

3 years ago

Read 2 more answers

Osmium (os) is the densest element known (density = 22.57 g/cm3). Calculate the mass in pounds and in kilograms of an os sphere

Rufina [12.5K]

<u>Answer:</u>

Mass in kg = 39.88

Mass in pounds = 87.92

<u>Explanation:</u>

We have the expression for Density, ρ = Mass / Volume, in this case density is given and we need to find mass and volume.

Volume of a sphere, we have the expression $V = \frac{4}{3} \pi r^3$ , where r is the radius of sphere.

Radius of sphere, r = Half of diameter = 15/2 = 7.5 cm

So $V = \frac{4}{3}* \pi* 7.5^3 = 1767.15 cm^3$

Mass = Volume * Density = 1767.15*22.57 = 39884.49 g

Mass in kg = 39884.49/1000 = 39.88 kg

Mass in pounds = 39.88*2.205 = 87.92 lb

4 0

3 years ago

How does the position of an object relate to the energy stored in an object?

Kamila [148]

Answer:

Potential Energy

Explanation:

Potential energy is the energy stored in an object due to it's position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.

4 0

3 years ago