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Faradays law: magnetic coil question

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Homework Statement


(The information is for several questions and i have posted one of them)

Two coils magnetically coupled, Voltage of 240v, 50Hz applied to coil 1, current of 2A flows, second coil connected only to a high impedance rms voltmeter reading 100v

find: The peak total flux linkage with coil 1

Homework Equations


e = d{lamdar}/dt


The Attempt at a Solution



ok re-arranging the equation to find {lamdar} which is the flux linkage in coil 1

{lamdar}=et

e = 240 (as given)
t = 1/f (and as radial 2 x pi x f) so t = 1/(2 x pi x f)
t = 2.18... x10-3

so {lamdar}= 0.7639 Wb-turns

but the answer given say should be 1.079Wb-turns

please help will be very gratefull have been at this for hours now.
 

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