Physics, 22.08.2019 04:10 buchaell000

Acertain elastic conducting material is stretched into a circular loop of 1.6 cm radius. it is placed with its plane perpendicular to a uniform 0.8 t magnetic field. when released, the radius of the loop starts to shrink at an instantaneous rate of 75.0cm/s. what emf is induced in the loop at that instant in units of v?

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Answer from: KiemaBear

Induced emf in the loop is 0.0603 volts.

Explanation:

It is given that,

Radius of the circular loop, r = 1.6 cm = 0.016 m

Magnetic field, B = 0.8 T

When released, the radius of the loop starts to shrink at an instantaneous rate of 75.0 cm/s, $\dfrac{dr}{dt}=75\ cm/s=0.75\ m/s$

We need to find the magnitude of induced emf at that instant. Induced emf is given by :

$\epsilon=\dfrac{-d\phi}{dt}$

Where

$\phi$ is the magnetic flux, $\phi=B\times A$

$\epsilon=\dfrac{-d(BA)}{dt}$ , A is the area of cross section

$\epsilon=-\dfrac{-d(B(\pi r^2))}{dt}$

$\epsilon=-2\pi r B(\dfrac{dr}{dt})$

$\epsilon=-2\pi \times 0.016\times 0.8 \times 0.75\ m/s$

$\epsilon=0.0603\ V$

So, the induced emf in the loop is 0.0603 volts. Hence, this is the required solution.

Answer from: Quest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

Answer from: Quest

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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Acertain elastic conducting material is stretched into a circular loop of 1.6 cm radius. it is place...

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