Answer:
EMF = 1.1929 V
Explanation:
In this case we need to use the following expression:
EMF = B *ΔA / t (1)
Where:
B: Magnetic field
ΔA: Difference of area of the balloon
t: time
To get the area, we have the innitial diameter of the balloon, and the expanded diameter when the balloon is blown up, so, assuming the circunference of the balloon, the area can be determined with:
A = π r² (2)
So, let's calculate the Area of the balloon before and after the blown. Remember to use the units in meter (I just divided the diameter by 2 to get the ratio, and then divide by 100 to convert the units of cm to m)
A₁ = π * (0.105)² = 0.0346 m²
A₂ = π * (0.155)² = 0.0755 m²
Now that we have both areas, let's calculate ΔA:
ΔA = A₂ - A₁
ΔA = 0.0755 - 0.0346 = 0.0409 m²
Finally, we can determine the value of the EMF, using (1):
EMF = 1.4 * 0.0409 / 0.048
<h2>
EMF = 1.1929 V</h2>
Hope this helps
