A toroid of mean radius ' \( a \) ', cross section radius ' \( r \) ' and total number of turns ....

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A toroid of mean radius ' \( a \) ', cross section radius ' \( r \) '
\( \mathrm{P} \)
and total number of turns N. It carries a current ' \( i \) ' The torque experienced by the toroid if a uniform magnetic field of strength \( B \) is applied:
(1) is zero
(2) is b \( i \mathrm{~N} \pi r^{2} \)
(3) is b \( i \mathrm{~N} \pi a^{2} \)
(4) depends on the direction of magnetic field.


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