Three copper wires have lengths and cross-sectional areas as (l, A); (2l, A2 ) and ( l2 …
Physics · Class 12 · CBSE — Current Electricity
Three copper wires have lengths and cross-sectional areas as (l, A); (2l, \(\frac A2\) ) and ( \(\frac l2\) , 2 A). Resistance is minimum in:
- wire of cross-sectional area \(\frac A2\)
- wire of cross-sectional area A
- wire of cross-sectional area 2 A
- same in all the three cases
Answer
(C) wire of cross-sectional area 2 A
Sign up free on Edukali to view the step-by-step worked solution and practice thousands of similar questions.
Related practice questions
- Charge passing through a conductor of cross-section area A = 0.3 m 2 is given by q = 3t 2 + 5t + 2 in…
- A current of 2 A flows through a 2 resistor when connected across a battery. The same battery supplies a…
- The voltage of clouds is 4 10 6 V with respect to ground. In a lightning strike lasting 0.1 s, a charge of 4…
- When three identical bulbs of 60-200 volt rating are connected in series to a 200 volt supply, the power…
- The emf and internal resistance of a cell are E and r respectively. It is connected across an external…
- Ten identical cells each of emf and internal resistance r are connected in series to form a closed circuit…
- When the switch of the circuit is turned on, the filament of the bulb glows instantaneously because:
- A cell of emf E is connected across an external resistance R. When current I is drawn from the cell, the…
More Current Electricity questions · Browse all practice questions