The length of a certain wire is halved while the radius is doubled. What is the change in the resistance of this wire?
A) It stays the same.
B) It is reduced by a factor of 2.
C) It is reduced by a factor of 4.
D) It is reduced by a factor of 8.
E) It is quadrupled.
D
You might also like to view...
Power: A 100-W driveway light bulb is on 10 hours per day. If the power company charges 10ยข for each kilowatt-hour of electricity used, estimate the yearly cost to operate the bulb if it is used every day for a 365-day year.
A. $3.65 B. $7.30 C. $37 D. $73
In the electron-wave model of the atom, the orbit of an electron in the ground state contains
A) a single wavelength. B) multiple wavelengths. C) even number quanta.
Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2 . Which of the following relative values for radii and lengths would result in equal resistances?
a. r1 = r2 and 4L1 = L2 c. 2r1 = r2 and 4L1 = L2 b. r1 = r2 and L1 = 2L2 d. 2r1 = r2 and L1 = 2L2
The main form of radiation that our bodies emit is __________
Fill in the blank(s) with correct word