Q149 / 180 · KCET 2010 · Physics

Two thick wires and two thin wires, all of same material and same length, form a square in three different ways $\mathrm{P}, \mathrm{Q}$ and $\mathrm{R}$ as shown in the figure. With correct connections shown, the magnetic field due to the current flow, at the centre of the loop will be zero in case of
Figure

  • A
    $Q$ and $R$
  • B
    P only
  • C
    $P$ and $Q$
  • Correct answer
    D
    P and R

Solution

In $P$ and $R$, current divides equally in two halves because of equal resistances in the two halves. Due to equal currents in two halves the current at the centre will be zero.

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

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