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Torque on current carrying loop - class-XII

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Multiple Choice

The torgue required to keep a magnet of length $20cm$ at $30^o$ to a uniform field is $2 \times^{-5}N-m$. The magnetic force on each pole is 

  1. $2\times ^{-4}N$
  2. $4 \times 10^{-4}N$
  3. $1\times 10^{-3}N$
  4. $2\times 10^{-6}N$
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