What's the meaning of 今　何を　しているの, is it means 'what r u doing now?'
If so, what's the difference between 今　何を　しているの　and 今　何を　していますか?

Question

What's the meaning of 今　何を　しているの,  is it means 'what r u doing now?'
If so, what's the difference between 今　何を　しているの　and 今　何を　していますか?

Answer

今　何を　しているの- This is the informal way of asking (friends, family...)
今　何を　していますか-This is the formal way of asking (teachers, coworkers, acquaintances...)

Both mean "What are you doing(right now)"?

いる = います 
   の = か       when used at the end of a sentence.

This type of speaking is very common and used frequently by friends