Answer:
when the water is heated with immersion heater, the water becomes less dense due to which the warm water rises up and the cooler water fills it's space.
 
        
             
        
        
        
Answer:
Option A) n
Explanation:
In accordance to Quantum Mechanical model of an atom:
- The Principle Quantum number (n) gives the description of the shell of an electron and the energy level of an electron in an atom.
- The angular momentum also referred to as Azimuthal Quantum number (l) gives the description of  the shape of the orbitals and helps in determination of angular momentum magnitude.
- The magnetic quantum number ( ) describes the energy levels or the number of orbitals contained in a subshell and the way these are oriented within. ) describes the energy levels or the number of orbitals contained in a subshell and the way these are oriented within.
- The spin quantum no. ( ) determines the elelctron spin's direction which may be ( ) determines the elelctron spin's direction which may be ( ) or ( ) or ( ). ).
 
        
             
        
        
        
The fibers have lost electrons giving them a positive charge. The rubber gained electrons giving it a negative charge. The positively charged fibers are now attracted to the negatively charged balloon. The negatively charged balloon attracts the paper.