Question

While demonstrating Faraday's law to her class, a physics professor inadvertently moves the gold ring on her finger from a location where a 0.83 T magnetic field points along her finger to a zero-field location in 43 ms . The 1.8 cm -diameter ring has a resistance and mass of 49 μΩ and 12 g , respectively

Estimate the thermal energy produced in the ring due to the flow of induced current.

Express your answer using two significant figures.

Q =

  

mJ

Find the temperature rise of the ring, assuming all of the thermal energy produced goes into increasing the ring's temperature. The specific heat of gold is 129 J/kg⋅∘CJ/kg⋅∘C.

Express your answer using two significant figures.

ΔT =

  

∘C

Answer 1