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The conducting block of square cross-section (3mm by 3mm) of length 25cm is connected at the...

The conducting block of square cross-section (3mm by 3mm) of length 25cm is connected at the end by a block of the same cross-section but of the length of 40cm. First block made of material with resistivity of 1.5×10-6Ωm and second block’s resistivity is 1.8×10-6Ωm. Find the resistance of the entire block between two ends.

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