in 21 July
The North pole
Where it was on the other 364 days of the year. The North Pole does not move, you are thinking of the Magnetic North Pole.
north pole
The northern hemisphere is experiencing winter when the north pole is experiencing 24 hours of darkness.
It depends. in the winter for the northern hemisphere ( North America ) the north pole has 24 hours of darkness or Greenland and in summer for Northern Hemisphere the south pole ( Antarctica ) has 24 hours of darkness so it really is north and south pole
On a solstice, it is only at the equator that the hours of light and dark are equal. At other parts, they would be different with one of the Poles experiencing 24 hours of daylight and the other Pole experiencing no daylight. If it is the June solstice, then it is the North Pole with 24 hours of daylight and the South Pole with none, while it is the opposite in the December solstice. It is at the equinox that the amount of daylight and darkness hours are equal around the world.
24 Hours. On summer solstice the earth is tilted toward the sun and it shines continuously at the north pole.
Winter
That will depend on where exactly you are in the northern hemisphere. Close to the equator it will be about 12 hours, while at the North Pole it will be 24 hours. So it is anything from 12 to 24 hours, depending on your specific location.
21st of June.
yes...
24 Hours of straight sunlight