Which of the following operates based on magnetic effect of electric current?

When a charged ebonite rod is brought near a charged glass rod, there will be 

Pilots uses aneroid barometer to know the height above sea level because 

A light ray passing from air into water at an angle of 30º from the normal in air would 

A solid cube of aluminum is 1.5cm on each edge. The density of aluminum is 2700kgm\(^{-1}\). Find the mass of the cube.