The compasses would start point towards the wire. When you have a current going through wire it messes with the electrical field and messes up the compasses so they point towards the wire.
Hope this helps!
Answer=Density
D=m/v (the mass in a given volume is the density)
Answer:
Explained
Explanation:
Your tutor is completely wrong here. Ampere and volt are both completely different concept. Ampere measure current in circuit, whereas volt measure the potential difference across two points in circuit. It is due to this difference in the potential that leads to flow of current in the circuit. The potential difference is the cause and current is the effect.
Answer:
a) 
b) 
Explanation:
The law of conservation of mechanical energy states that total mechanical energy remains constant during oscillation. Mechanical energy is defined as the sum of kinetic energy and potential energy:

a) The position is one-third the amplitude. So, we have
. Replacing and solving for K

b) The potential energy is defined as:

Replacing:
