1. The problem statement, all variables and given/known data An electric generator consists of n = 500 turns of wire formed into a rectangular loop with a length of 5 cm and width of 3 cm placed in a uniform magnetic field of 2.50 T. What is the maximum value of the emf produced when the loop is spun at f = 100 rpm about an axis perpendicular to B? a. 19.6 V b. 144 V c. 95.3 V d. 79.2 V e. 60.3 V 2. Relevant equations ε=-NΔ∅B/Δt ∅B=BAcosβ 3. The attempt at a solution For a maximum emf there must be a maximum change in either B or A, but because A is constant B must be the variable changing. As the loop rotates B varies from 0T to 2.5T and it takes half a loop to do that. ε=NAB/Δt ε=500*(.03m*.05m)*(2.5T)/Δt Δthalf a revolution: =>100rpm*1min/60s=1.67rev/sec => 1 revolution takes .6s => .5 revolutions take .3s ε=500*(.03m*.05m)*(2.5T)/Δt ε=500*(.03m*.05m)*(2.5T)/.3s ε=6.25V The answer I get is not in the options, and I dont see what I am doing wrong? Thanks!