Question 26
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A) An aluminum wire of length 5m and having a cross sectional area $1.35 \times 10^{-4}$ m² is converted into 2-
turn circular loop. It is connected to a voltage of 0.154 V. If the loop is placed in a uniform magnetic
field of magnitude 0.77 T at an angle of 79°, then what is the torque produced in the loop? (The
resistivity ($\rho$) of Tungsten = $2.80 \times 10^{-8}$ ?.m.)
(3.5
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If aluminum wire length is decreased from 5m to 2m, will the torque increase, decrease or remains
same, when all other values are the same. Explain your answer.
(1.5 Marks)
B)i) In a material lab, an experiment is being conducted, in which a material needs to be used. As per
the requirement of experiment, material should conduct energy of 15000J. Following two materials are
available in the lab.
\begin{itemize}
\item Material A of area 72 cm² and 3.2cm thick. With increase in temperature from 292 K to 298 K, if
thermal conductivity is 385J/m.°K.s
\item Material B of area 122 cm² and 2.7cm thick. With increase in temperature from 280 K to 292 K, if
thermal conductivity is 109J/m.°K.s
\end{itemize}
Through calculation, show that which material will take more time to conduct 15000J? (5marks)
