physics

A square coil of side 0.5 m is placed with its plane perpendicular to the direction of the magnetic field. What is the flux change in the coil if the magnetic field changes from 0.1 Tesla to 0.5 Tesla?
Choose one answer.
a. 0.1 Weber
b. 0.2 Weber
c. 0.8 Weber
d. 1.6 Weber

the area is 0.5*0.5 but im stuck

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