Multiple Choice
The length of a certain wire is doubled and at the same time its radius is tripled. What is the change in the resistance of this wire?
A) It stays the same.
B) It is reduced by a factor of 4.5.
C) It is doubled.
D) It is tripled.
E) It is quadrupled.
Correct Answer:

Verified
Correct Answer:
Verified
Q52: Two 100 W lightbulbs are to be
Q53: The power rating of a resistor is
Q54: FIGURE 21-4 <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6213/.jpg" alt="FIGURE 21-4
Q55: An RC circuit consists of 2.0 MΩ
Q56: A 8.0 μF capacitor is connected in
Q58: The length of a certain wire is
Q59: FIGURE 21-3 <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6213/.jpg" alt="FIGURE 21-3
Q60: The potential difference between the ends of
Q61: A light bulb operating at a voltage
Q62: FIGURE 21-19 <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6213/.jpg" alt="FIGURE 21-19