A magnetic needle suspended parallel to a magnetic field requires J of work to turn it through . The torque needed to maintain the needle in this position will be:
1. 3 J
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA short bar magnet of magnet moment 0.4 is placed in a uniform magnetic field of 0.16 . The magnet is in stable equilibrium when the potential energy is :
1. 0.064 J
2. – 0.064 J
3. Zero
4. – 0.082 J
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology