Two electric lamps of $40\, watt$ each are connected in parallel. The power consumed by the combination will be ........... $watt$
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(c) ${P_p} = nP = 2 \times 40 = 80\,W$
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In an aluminium $(A1)$ bar of square cross section, a square hole is drilled and is filled with iron ( $Fe$ ) as shown in the figure. The electrical resistivities of $A 1$ and $Fe$ are $2.7 \times 10^{-8} \ \Omega m$ and $1.0 \times 10^{-7} \ \Omega m$, respectively. The electrical resistance between the two faces $P$ and $Q$ of the composite bar is
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