Question

Constants Periodic Table Part A A ring with a radius of 2.0 cm and a resistance of 0.0252 is What is the largest number of electrons that would flow past a fixed point in the ring as this process is accomplished? a magnetic field of 0.29 T nenendicular to tat av Express your answer using two significant figures. ΠVΠ ΑΣΦ Nmax electrons

A ring with a radius of 2.0 cm and a resistance of 0.025Ω is rotated about an axis through its diameter by 90∘ in a magnetic field of 0.29 T perpendicular to that axis.

What is the largest number of electrons that would flow past a fixed point in the ring as this process is accomplished?

Answer 1

Hence the ring placed in magnetic field is rotated Therefore magnetic flux is charged and e m f is induced in the ring phi = B A cos theta the ring is rotated from 0 degree to 90 degree delta phi = phi_f - phi_1 = B A [cos theta_f - theta_1] = pi r^2 B [cos theta_f - cos theta_1] = pi times (0.02 m)^2 times 0.2 s T times [cos 90 degree - cos o degree] = - 3.64 times 10^- 4 wb now e m f induced due to this charge in magnetic flux E = - d phi/delta t the induced current in the ring I = E/R = - 1/R delta phi/delta t R Rightarrow resistance Rightarrow the charge passed in the time interval delta t delta q = I delta t = - 1/R delta phi/delta t delta t = - delta phi/R