In a Wheatstone's bridge all the four arms have equal resistance \(R\). If the resistance of the galvanometer arm is also \(R\), the equivalent resistance of the combination as seen by the battery is

• A

  \(2 \mathrm{R}\)
• B

  \(\frac{R}{4}\)
• C

  \(\frac{R}{2}\)
• Correct answer
  D

  \(\mathrm{R}\)

Solution

Since, wheatstone's bridge is balanced, then resistance of galvanometer will be uneffective.

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