Inside a cylindrical region of radius R=2 m, the magnetic field changes at dB/dt=2 T s⁻¹. A particle of charge q=2 C is at distance d from the centre. It is moved tangentially/quasistatically to infinity so that it gains no kinetic energy. Select the correct statements.

Question

G1 Physics · Accepted Answer

For r>R, the induced tangential electric field is E=R²(dB/dt)/(2r). The external force balances qE during quasistatic motion. Integrating the work along the specified path gives 4π J, independent of the initial distance d. Hence all four listed statements are correct.