Answer:
C. 2.0 cm
Explanation:
The magnetic field around the wire at point M is given by Biot-Savart Law:
where,
B = Magnetic field = 50 μT = 5 x 10⁻⁵ T
I = current = 5 A
μ₀ = permeability of free space = 4π x 10⁻⁷ N/A²
R = distance of point M from wire = ?
Therefore,
R = 0.02 m = 2 cm
Hence, the correct option is:
<u>C. 2.0 cm</u>
Answer:
The Law of the Conservation of Energy
Explanation:
The Energy Conservation Act tells us that any form of energy changes from one form to another. And that you can never have a higher amount of energy than you originally got. That is, if you have 100 [J] of energy to be transferred as heat from one medium to another, only 100 [J] can be used to be transferred, no amount greater than this value can be transferred.
The particular study of Energy Transfer in the form of heat is important in sciences such as thermodynamics and heat transfer.
Let 
and 
be the vectors, and let 
be their common magnitude.
The resultant 
is 
times larger in magnitude than either vector alone, so 
.
Recall the dot product identity
where 
is the angle between the vectors 
and 
. In the special case of 
, we get
Now, to get the angle between and , we have
To compute the dot product, we take the dot product of the resultant with itself.
Solve for 
.
Since their dot product is zero, and are perpendicular, so 
.
