Answer:
Explanation:
Given
density 
diameter 
Magnetic field 
Force on the current carrying conductor placed in a magnetic field

where L=length of conductor
=angle between magnetic field and current
If the wire is floating then weight must be balanced by weight of wire

Therefore




Answer:
C. Both a and b
Explanation:
Firstly, persons and objects in a moving plane as described in this question, are moving at the same speed as the plane even if there is no individual movement of these objects.
However, this question describes a person sitting still in a moving plane. This means that;
- The person is motionless in relation to everything in the plane i.e the person is not moving even if other things in the plane are.
- The person is in motion compared to everything on the ground i.e. the person is moving at the same speed as the plane, hence, in comparison with the ground, the person is moving.
Therefore, options A and B are correct
Answer:
Between 120 and 180 seconds
A sound wave traveling eastward through air<span> causes the air molecules to Vibrate east and west. </span>