Convert 0.000238 m to cm

In the general world view of magnetism, magnetic fields arise from : stationary color charges

Paladinen [302]

Answer:

The correct option is "moving electric charges or currents".

Explanation:

Magnetic field is used to define as a field that surrounds a current carrying conductor or moving electric charge by virtue of which it exerts a force on another current carrying conductor or a moving charge itself.

The magnetic field generated by a moving charge is given by

$B=\frac{\mu _{o}q}{4\pi }\times \frac{v\times r}{|r|^{3}}$

where

q = is the magnitude of charge

v = is the velocity vector of the moving charge

r = is the position vector of the point at which the field is calculated

|r| = is the magnitude of position vector.

Similar the magnetic field generated by a current carrying conductor is given by

$B=\frac{\mu _{o}I}{4\pi }\times \int \frac{dl\times r}{|r|^{2}}$

where

I is the current

The integration is carried out along the whole length of conductor.

Also since magnetic mono poles do not exist or their existence is not confirmed until now so it is not an appropriate option.

6 0

3 years ago

Conclusion of experiment for determine the magnitude and direction of magnetic field of earth What we will write in our experime

Tema [17]

Answer:

The magnitude and direction of the earth's magnetic field is between the range of 0.25 to 0.65 Gauss considering the angle of the earth's north pole is eleven degrees.

Explanation:

The magnetic field or force of the earth is attributed to a dynamo effect but the electric charges are not constant. The origin of the field is believed to be from the molten metallic core and the earth's rotation.

The Force of the magnetic field is a function of the velocity or speed 'v' of the electric charges 'q' and the field itself 'B' at an angle of sin∅. That is,

F = vqBsin∅

6 0

3 years ago

A piston–cylinder device initially contains 2 L of air at 100 kPa and 25°C. Air is now compressed to a final state of 600 kPa an

bagirrra123 [75]

Answer:

a. The energy of the air at the initial and the final states is 0kJ and 0.171kJ respectively

b. 0.171kJ

c. 0.143

Explanation:

a.

Because there are same conditions of the state of air at the surroundings and at the Initial stage, the energy of air at the Initial stage is 0kJ.

Calculating energy at the final state;

We start by calculating the specific volume of air in the environment and at the final state.

U2 = At the final state, it is given by

RT2/P2

U1= At the Initial state, it is given by

RT1/P1

Where R = The gas constant of air is 0.287 kPa.m3/kg

T2 = 150 + 273 = 423K

T1 = 25 + 273 = 298K

P2 = 600KPa

P1 = 100KPa

U2 = 0.287 * 423/600

U2 = 0.202335m³/kg

U1 = 0.287 * 298/100

U1 = 0.85526m³/kg

Then we Calculate the mass of air using ideal gas relation

PV = mRT

m = P1V/RT1 where V = 2*10^-3kg

m = 100 * 2 * 10^-3/(0.287 * 298)

m = 0.00234kg

Then we calculate the entropy difference, ∆s. Which is given by

cp2 * ln(T2/T1) - R * ln(P2/P1)

Where cp2 = cycle constant pressure = 1.005

∆s = 1.005 * ln (423/298) - 0.287 * ln(600/100)

∆s = -0.1622kJ/kg

Energy at the final state =

m(E2 - E1 + Po(U2 - U1) -T0 * ∆s)

E2 and E1 are gotten from energy table as 302.88 and 212.64 respectively

Energy at the final state

= 0.00234(302.88 - 212.64 + 100(0.202335 - 0.85526) - 298 * -0.1622)

Energy at the final state = 0.171kJ

b.

Minimum Work = ∆Energy

Minimum Work = Energy at the final state - Energy at the initial state

Minimum Work = 0.171 - 0

Minimum Work done = 0.171kJ

c. The second-law efficiency of this process is calculated by ratio of meaningful and useful work

= 0.171/1.2

= 0.143

3 0

3 years ago

What formal regions are located in the western hemisphere

Tju [1.3M]

Answer: Part of Europe, part of Africa, part of Antarctic and the entire America.

Explanation: Western hemisphere or west hemisphere encompasses all regions located west of the longitude 0 °, or meridian of Greenwich.

The formal regions located in the western hemisphere is Europe, Africa, Antarctic and America.

4 0

3 years ago

When an astronaut in orbit experiences apparent weightlessness,

Leviafan [203]

D. The net gravitational force on the astronaut is not balanced by a normal force

8 0

4 years ago

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