Doubling the current, number of turns, the area, and the ambient magnetic field for a coil changes the maximum torque it experiences by what factor?
A. 2
B. 4
C. 8
D. 16
E. 32
D. 16
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If you focused a store-bought telescope at a tree down the street on a clear day, the tree would be viewed as ______________ and _____________
a. right side up, larger b. upside down, larger c. right side up, smaller d. upside down, smaller
The energy levels for electrons vary from one element to another
Indicate whether the statement is true or false
If 3.0 × 1015 electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s, what is the current in the wire? (e = 1.60 × 10-19 C)
A) 0.12 mA B) 0.24 mA C) 7.5 × 107 A D) 7.5 × 1014 A
Estimate the volume of a helium-filled balloon if it is to lift a payload of 1000 kg. The density of air is 1.29 kg/m3 and helium has a density of 0.178 kg/m3
a. 4410 m3 c. 450 m3 b. 900 m3 d. 225 m3