KVPY2015PhysicsMagnetic Properties of Matter
A metallic ring of radius a and resistance R is held fixed with its axis along a spatially uniform magnetic field whose magnitude is B ₀ ( t ) . Neglect gravity. Then;
Options
- Athe current in the ring oscillates with a frequency of 2
- Bthe joule heating loss in the ring is proportional to a ²
- Cthe force per unit length on the ring will be proportional to B₀²
- Dthe net force on the ring is non-zero
Correct answer
C. the force per unit length on the ring will be proportional to B₀²
Step-by-step solution
d F d L = B R ( d B A d t ) Where B = B ₀ t