The magnetic field at the earth's surface can vary in response to solar activity. during one intense solar storm, the vertical component of the magnetic field changed by 2.8 ? t per minute, causing voltage spikes in large loops of the power grid that knocked out power in parts of canada.

what emf is induced in a square 190km on a side by this rate of change of field?

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Aspecified volume of space contains an electric field for which the magnitude is given by e=e0cos(ωt). suppose that e0 = 20 v/m and ω = 1.0 × 107 s−1. part a what is the maximum displacement current through a 0.80 m2 cross-sectional area of this volume? express your answer with the appropriate units. idisp,max i d i s p , m a x = nothing nothing request answer part b how would this area have to be oriented relative to the electric field to get this maximum displacement current?

You add 800 ml of water at 20c to 800 ml of water at 80c what is the most likely final temperature of the mixture ? a. 100c b. 60c c. 25 c d.50c