The answer for above problem is explained below.

Q 13.49: Calculate the combined R value of one layer of goose down, 5.62 cm thick,...
Q 13.28: Calculate the combined R value of one layer of goose down, 5.32 cm thick, and one layer of wool, 2.97 cm thick. m²K W
For a disk of radius R = 35 cm
and Q = 3 ✕ 10−6 C, calculate the
electric field 3 mm from the center of the disk using all three
equations. (Enter the magnitude.)
Efirst
=
N/C
Esecond
=
N/C
Ethird
=
N/C
How good are the approximate equations at this distance?
Both the second and third values are within 5% of the first,
most accurate value.The second value is within 5% of the first,
most accurate value. The third...