A cosmic ray proton falls vertically downwards from sky at a speed of 4.0 x 10^5 m/s in a region where the magnetic field of the Earth has the magnitude 5.0 x 10^-5 T and is directed towards the
north and downward at 30° below horizontal. The magnitude and direction of the magnetic
force on the proton is:
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when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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