Faraday discovered changing magnetic fields create electric fields in the 1820s. Why did it take sixty years before changing electric fields creating magnetic fields were discovered?

A loop has a magnetic flux through it changing at the rate of 1 T-m^2/s. What is the integral of the electric field around the loop? A second loop has a displacement current flux changing at a rate of 1 V-m/s. What is the integral of the magnetic field around the loop.

Please help me with both of these questions.