Complete question:
A long, straight wire lies along the z-axis and carries a 4.00-A current in the +z-direction. Find the magnetic field (magnitude and direction) produced at the following points by a 0.500-mm segment of the wire centered at the origin:
(a) x = 2.00 m, y = 0, z = 0;
(b) x = 0, y = 2.00 m, z = 0;
(c) x = 2.00 m, y = 2.00 m, z = 0; (d) x = 0, y = 0, z = 2.00 m.
Answer:
a)
;
b)
;
c)
;
d) 0
Explanation:
Given
I = 4.20A
P = 0.500mm
a) r= (2.00m) i
∆
;
;
b) r = (2.00m) j
∆
;
;
c) r = (2.00m) (i+j)
;
∆
;
;
d) r = (2.00m) k
∆
;
B = 0
Ocean waves would be the correct answer
Your welcome!!!!!!!!!!!!
Answer:


Explanation:
r = Radius of circle = 7 m
w = Width of dam = 60 m
h = Height of the dam will be half the radius = 
A = Area = 
V = Volume = 
Horizontal force is given by

Vertical force is given by

Resultant force is

The hydrostatic force on the dam is
.
The direction is given by

The line of action is
.
The question is incomplete. If D=1/T then the answer is D, but if instead of =, there is a proportional sign, then the answer is C.
Answer: 150 m
Explanation:
velocity = 22 m/s
t = 6.8 s
velocity = 
distance = velocity × time
= 22 × 6.8
= 149.6 m
≈ 150 m
option C