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(A) Initial configuration: The five solid lines represent five resistors of $1\, \Omega$ each connected in series. Therefore,the initial equivalent re

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(A) Initial configuration: The five solid lines represent five resistors of $1\, \Omega$ each connected in series. Therefore,the initial equivalent resistance is $R_i = 1 + 1 + 1 + 1 + 1 = 5\, \Omega$.Final configuration: When the two dashed resistors are added,the circuit forms a bridge-like structure. The resistors are arranged such that the equivalent resistance $R_f$ becomes $3\, \Omega$.The change in resistance is $\Delta R = |R_i - R_f| = |5 - 3| = 2\, \Omega$.

Five identical resistors are initially arranged as shown in the figure by solid lines. If two identical resistors are added as shown by the dashed lines,the change in the equivalent resistance between the initial and final configurations is ....... $\Omega$.

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