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ong>18) 'R' is directly proportional to 'l'P>

\:\:\:\:\:\:\:\:\:\:\frac{ R_{1} }{ R_{2} } = \frac{ l_{1} }{l_{2}}=> \frac{ <klux>10</klux> }{ R_{2} } = \frac{ 100}{ 125 } \: \: \: \: \: \: \: \: \: \: \: \: \\ R_{2} = 12.5 \: ohms\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:

19) P = W/t = mgh/t

5000 = (m × 9.8× 10)/(5×60)

m = (5000 × 300)/98

m = 15306.12 kg


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