Q106 / 120 · VITEEE 2007 · Physics

A conductor and a semi-conductor are connected in parallel as shown in the figure. At a certain voltage both ammeters registers the same current. If the voltage of the DC source is increased then Figure

  • A
    the ammeter connected to the semiconductor will register higher current than the ammeter connected to the conductor
  • B
    the ammeter connected to the conductor will register higher current than the ammeter connected to the semiconductor
  • Correct answer
    C
    the ammeters connected to both semiconductor and conductor will register the same current
  • D
    the ammeter connected to both semiconductor and conductor will register no change in the current

Solution

Since conductor and semiconductor are connected in parallel hence voltage across them is same. If ammeters show same reading hence their resistances $\mathrm{R}=\frac{\mathrm{V}}{\mathrm{I}}$ are same. If voltage is increased by small value then following the same relation $\mathrm{V} \propto \mathrm{I}$ for constant $R$, both conductor and semiconductor show same current.

Hence, the correct answer is option: 'C'.

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