An observer that stands still as the electron moves by him, will observe a) an electric field b) an electric & magnetic field c) a magnetic field d) an absence of fields

When charge is placed near to us whether it is stationary or if it is in motion then we can say it will produce electric field.

Now when charge is in motion then it will also produce electric current

So due to a moving charge there is some magnetic field also near it

it is given as

So here we can say that nearby a moving charge we must have experience the effect of electric field as well as magnetic field

so the correct answer must be

B) An electric & magnetic field

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

heat the gas and measure the pressure