physics ch2

answer b

for regular polygons with the same perimeter, more sides means more area. The circle is the limit of that trend (infinitely many sides), so it encloses the most area of any shape with a given perimeter.

answer d

The current (I) will be distributed in all 3 resisotors

so the I in wire XY will be I/3

answer a

answer b

answer

d

c

The Earth's horizontal magnetic component H is a uniform (constant) magnetic field that fills the entire space surrounding the wire.

answer a