A horizontal circular wire loop of radius 0.7 m lies in a plane perpendicular to

Question

A horizontal circular wire loop of radius 0.7 m lies in a plane perpendicular to a uniform magnetic ?eld pointing from above into the plane of the loop, has a magnitude of 0.47 T. If in 0.13 s the wire is reshaped from a circle into a square, but remains in the same plane, what is the magnitude of the average induced emf in the wire during this time? Answer in units of V The current in the loop during the deformation 1. does not arise. 2. ?ows in a direction that cannot be determined from given information. 3. ?ows clockwise when viewed from above. 4. ?ows counter-clockwise when viewed from above.

Explanation / Answer

= BA/t

Initial Area = R^2

= *0.7^2

= 1.539 m^2

As perimeter remains same

Therefore

4L = 2R

L = 1.1 m

Therefore

Final Area = 1.1^2

= 1.21 m^2

Theefore

Induced EMF , = (0.47*(1.539 - 1.21))/0.13

= 1.19 V

3. Flows clockwise when viewed from above.

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