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## Homework Statement

A simple generator has a coil with dimensions 1.0 cm x 1.0 cm which

is rotated at 60 Hz in 1.0 T magnetic field. How many windings (turns of

wire) are needed to generate a peak emf of 120 Volts ?

## Homework Equations

1. emf E = - d (magnetic flux) / dt

2. magnetic flux = (

**B**dot

**n**hat) A

3. emf E for generator(rotating coil/loop) = N B A w(sin wt) where N is number of turns, B is magnetic field, A is area of coil, w is omega = 2 pi f

## The Attempt at a Solution

Is it correct to assume the coil is a square coil? since it only gives me those two dimensions..

i used equation 3 above and used A = .01 m(squared), B = 1.0 T , omega w = 2 pi f, f = 60 Hz, and emf E = 120 V

but i don't know what "t" is for sin(wt)... do i even need that part of the equation to solve this problem?

what exactly does "peak emf" mean? does it mean amplitude, in which case i only need NBAw?