Verified Solution • 2025–26 Session moderate

QAIPMT-2006-Ph-2450: NEET 2006 Physics - Class 12 AIPMT-2006-Ph-2450 Solution: Two cells having the same e.m.f. are connected in series…

Two cells having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r1r_1 and r2r_2 (r1>r2r_1 > r_2) respectively. When the circuit is closed the potential difference across the first cell is zero. The value of R is r1+r2r_1+r_2 r1−r2r_1-r_2 r1+r22\frac{r_1+r_2}{2} r1−r22\frac{r_1-r_2}{2}

Multiple Choice Options

  • A ratio of voltage in primary and secondary may be increased
  • B energy losses due to eddy currents may be minimised
  • C the weight of the transformer may be reduced
  • D rusting of the core may be prevented.

Step-by-Step Verified Solution

The core of a transformer is laminated to minimise the energy losses due to eddy currents.

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