One end of copper wire of length $$2L$$ and cross sectional area A is attached to one end of another copper wire of length L and cross section area $$2A$$. If the free end of the longer wire is at electric potential of $$8$$ volt and free end of shorter wire is at potential of $$1volt$$,what is the potential of junction of two wires.

Question

Infinity Learn · Accepted Answer

resistance of the longer wire is $$R=$$ρ$$2LA$$ and  that of the shorter wire is $$R2=$$ρ$$L2A$$ $$R1R2=$$ $$41$$  in series p.d  is directly proportional to resistance so total p.d $$8-1=$$ $$7V$$ will be distributed $$4$$:$$1$$ ratio p.d across first conductior $$75x4=5.6$$ V potential at the junction $$8-5.6=2.4V$$

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material