Hello
1) First of all, since we know the radius of the wire (

), we can calculate its cross-sectional area

2) Then, we can calculate the current density J inside the wire. Since we know the current,

, and the area calculated at the previous step, we have

3) Finally, we can calculate the electric field E applied to the wire. Given the conductivity

of the aluminium, the electric field is given by
I think it's 'C' but I won't know for sure until you let me see the diagram.
Answer:
(a) 
(b) 
Explanation:
mass, m = 2.3 kg
vx = 40 m/s
vy = 75 m/s
(a) Angular momentum is given by

Where, p is the linear momentum and r is the position vector about which the angular momentum is calculated.
Here, 



So, the angular momentum


(b) Here, 



These are called neap tides!
Hope this helps :)