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drek231 [11]
3 years ago
9

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

Physics
1 answer:
Paladinen [302]3 years ago
6 0

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.

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A sound source of frequency f moves with constant velocity (less than the speed of sound) through a medium that is at rest. A st
ANTONII [103]

Answer:

The correct answer is d

Explanation:

In this exercise they ask us which statement is correct, for this we plan the solution of the problem, this is a Doppler effect problem, it is the frequency change due to the relative speed between the emitter and the receiver of sound.

The expression for the Doppler effect of a moving source is  

f ’= (v / (v- + v_s) f  

From this expression we see that if the speed the sound source is different from zero feels a change in the  frequency.

The correct answer is d

7 0
3 years ago
A racing car reaches a speed of 42 m/s. It then begins a uniform negative acceleration, using its parachute and braking system,
NARA [144]

As per the question the initial speed of the car [ u] is 42 m/s.

The car applied its brake and comes to rest after 5.5 second.

The final velocity [v] of the car will be zero.

From the equation of kinematics we know that

                                         v=u+at [ here a stands for acceleration]

                                         0=42 +5.5a

                                         a =\frac{-42}{5.5} m/s^2

                                          a= -7.64 m/s^2

Here a is taken negative as it the car is decelerating uniformly.

We are asked to calculate the stopping distance .

From equation of kinematics we know that

                                              S=ut+\frac{1}{2} at^2  [here S is the distance]

                                                      = 42*5.5 +\frac{1}{2} [-7.64] [5.5]^2 m

                                                       =115.445 m      [ans]  

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3 years ago
Recall that photosynthetic rates remain relatively constant in regions near the equator. Imagine that tropical environments pers
solniwko [45]

Answer:E.

a straight line sloping upward (atmospheric CO2 levels would not seasonally oscillate, but would have increased over time)

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During photosynthesis, energy conversion from light energy into chemical energy takes place.

Photosynthesis is one of the major processes that helps to eliminate and reduce the quantity of carbon dioxide in the atmosphere,it also serve to make oxygen present in the atmosphere.

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3 years ago
The equation for gear ratio
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In a gear train with two gears, the gear ratio is defined as follows
R= \frac{\omega _A}{\omega _B} 

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This can be rewritten as a function of the number of teeth of the gears. In fact, the angular velocity of a gear is inversely proportional to the radius r of the gear:
\omega = \frac{v}{r}
But the radius is proportional to the number of teeth N of the gear. Therefore we can rewrite the gear ratio also as
R= \frac{\omega _A}{\omega _B} = \frac{r_B}{r_A} = \frac{N_B}{N_A}

4 0
3 years ago
Mr. Patel is looking for his cat in the garden at night. It is completely dark outside. Mr Patel shines his torch at the tree. W
UNO [17]

Answer:

the tree's light reflects into his eyes.

I think this is the ans

Explanation:

3 0
3 years ago
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