Answer:
A. Zero
Explanation:
The force on a coil of N turns, enclosing an area, A and carrying a current I in the presence of a magnetic field B, is :
F = N * I * A * B * sinθ
Where θ is the angle between the normal of the enclosed area and the magnetic field.
Since the normal of the area is parallel to the magnetic field, θ = 0
Hence:
F = NIABsin0
F = 0 or Zero
Density = (mass) / (volume)
Mass = 0.150 kg = 150 grams
Volume = (length) · (width) · (height)
Volume = (2.5 cm) · (4.3 cm) · (1.98 cm)
Volume = 21.285 cm³
Density = (150 g) / (21.285 cm³)
Density = 7.05 g/cm³
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A. The restoring force is tripled