Physics
Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare (i) their resistances (ii) their specific resistance.
Related Questions
A car bulb connected to a 12 volt battery draws 2 A current when glowing. What is the resistance of the filament of the bulb? Will the resistance be more, same or less when the bulb is not glowing.
In an experiment of verification of Ohm's law, following observations are obtained.
Potential difference V (in volt) 0.5 1.0 1.5 2.0 2.5 Current I (in amp) 0.2 0.4 0.6 0.8 1.0 Draw a V-I graph and use this graph to find —
(a) the potential difference V when the current I is 0.5 A.
(b) the current I when the potential difference V is 0.75 V.
(c) the resistance in circuit.
A given wire of resistance 1 Ω is stretched to double it's length. What will be it's new resistance?
A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross-section, what will be it's new resistance?