Advertisements
Advertisements
प्रश्न
How is the resistance of a wire affected if its (a) length is doubled, (b) radius is doubled?
Advertisements
उत्तर
(a) Resistance of a wire is directly proportional to the length of a wire; so if the length is doubled, resistance is also doubled.
(b) Resistance of a wire is inversely proportional to the area of cross-section the wire. Thus, if radius is doubled, area increases four times and hence the resistance becomes one-fourth.
APPEARS IN
संबंधित प्रश्न
Write symbol and state function of following component in an electric circuit :
voltmeter
Explain why does a metal wire when connected to a cell offer resistance to the flow of current.
How are the potential difference (V), current (l) and resistance (R) related?
State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows.
What do you understand by the term quantity of electric charge?
What is the other name of a variable resistor?
What is the SI unit of resistance?
