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Different combination of 3 resistors of equal resistance R are shown in the figures. The increasing order for power dissipation is [Figure: the same current I enters each combination. (A) two R in parallel, then one R in series. (B) two R in series, that pair in parallel with one R. (C) three R in parallel. (D) three R in series.]

Asked in JEE Main 13th April 1st Shift 2023 · Heating and power in resistors

• (1) P_C<P_D<P_A<P_B
• (2) P_A<P_B<P_C<P_D
• (3) P_B<P_C<P_D<P_A
• (4) P_C<P_B<P_A<P_D

Step-by-step solution

Why the other options are wrong

• (1) No standard slip gives this; it misplaces (D), which has the largest resistance.
• (2) Lists the combinations in label order without computing R_eq.
• (3) No standard slip gives this order; it would need R_B<R_C<R_D<R_A.

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