If in the circuit,power dissipation is $150\, W$,then $R$ is ............... $\Omega$.

  • A
    $2$
  • B
    $6$
  • C
    $5$
  • D
    $4$

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Two wires of same metal have the same length but their cross-sections are in the ratio $3:1$. They are joined in series. The resistance of the thicker wire is $10\,\Omega$. The total resistance of the combination will be ............. $\Omega$.

Write the equation for the equivalent resistance of $n$ resistors connected in series and the equation for the equivalent resistance of $n$ resistors connected in parallel.

For the shown circuit,find the effective resistance between the points $A$ and $B$.

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$A$ heating coil can heat the water of a vessel from $20\,^oC$ to $60\,^oC$ in $30$ minutes. Two such heating coils are put in series and then used to heat the same amount of water through the same temperature range. The time taken now will be ............ $min$ (neglecting thermal capacity of the coils).

The equivalent resistance of the circuit shown in the figure is ............. $\Omega$

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