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In Example 9.2b, the question states:
For the following data, what is the ratio of the resistivities of resistor A to resistor B?
Resistor A:
R (k-Ohms) = 2, radius (mm) = 1, L (cm) = 3
Resistor B:
R (k-Ohms) = 4, radius (mm) = 2, L (cm) = 6
A. 4:1
B. 2:1
C. 1:2
D. 1:4
The answer is D, but using the equation for resistance, R=(rho*L)/A, I keep getting a 2:1 ratio, or answer choice B. Any idea what I'm doing wrong?
For the following data, what is the ratio of the resistivities of resistor A to resistor B?
Resistor A:
R (k-Ohms) = 2, radius (mm) = 1, L (cm) = 3
Resistor B:
R (k-Ohms) = 4, radius (mm) = 2, L (cm) = 6
A. 4:1
B. 2:1
C. 1:2
D. 1:4
The answer is D, but using the equation for resistance, R=(rho*L)/A, I keep getting a 2:1 ratio, or answer choice B. Any idea what I'm doing wrong?