A copper wire and an iron wire, each having an area of cross section A and length `L_(1)` and `L_(2)` are joined end to end. The copper end is maintained at a potential `V_(1)` and the iron end at a lower potential `V_(2)` .If `sigma_(1)` and `sigma_(2)` are the conductivites, the potential of the junction will be

A copper wire and an iron wire, each having an area of cross-section A and lengths L_(1) and L_(2) are joined end to end. The copper end is maintained at a potential V_(1) and the iron end at a lower potential V_(2) . If sigma_(1) and sigma_(2) are the conductivities of copper and iron respectively, then the potential of the junction will be

The length of an iron wire is L and area of cross-section is A. The increase in length is l on applying the force F on its two ends. Which of the statement is correct

Two bars of same length and same cross-sectional area but of different thermal conductivites K_(1) and K_(2) are joined end to end as shown in the figure. One end of the compound bar it is at temperature T_(1) and the opposite end at temperature T_(2) (where T_(1) gt T_(2) ). The temperature of the junction is

A copper strip AB and an iron strip AC are joined at A . The junction A is maintained at 0^@ C and the free ends B and C are maintained at 100^@ C . There is a potential difference between

One end of a Nichrome wire of length 2L and cross-sectional area A is attached to an end of another Nichrome wire of length L and cross-sectional area 2A . If the free end of the longer wire is at an electric potential of 8.0 volts, and the free end of the shorter wire is at an electric potential 1.0 volts, the potential at the junction of the two wires is equal to

A wire of given metarial having length l and ares of cross-section A has a resistance of 4 Omega . What would be the resistance of another wire of the same meterial having length l/2 and area of cross-section 2A ?

If two wires of same length l and are of the cross-section A with young modulus Y and 2Y connect in series and one end is fixed on roof and another end with mass m makes simple harmonic motion, then the time period is

A block of mass M is suspended from a wire of length L, area of cross-section A and Young's modulus Y. The elastic potential energy stored in the wire is

An electron enters in high potential region V_(2) from lower potential region V_(1) then its velocity

An electron enters in high potential region V_(2) from lower potential region V_(1) then its velocity