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COMPARISON TASKS (CT) MT11-CT1: MOVING RECTANGULAR LOOPS In each case below, a r

ID: 1780849 • Letter: C

Question

COMPARISON TASKS (CT) MT11-CT1: MOVING RECTANGULAR LOOPS In each case below, a rectangular loop of wire is moving to the right at 4 m/s magnetic field pointing into the page. In Case B, the field is four times as strong as in Case A. the rectangular loops have different widths and heights, but they are made from identical wires. At the instant shown, both loops are halfway into the uniform magnetic field regions IN UNIFORM MAGNETIC FIELDS-MAGNETIC FLUX into a region with a Case B 1s the magnefic flex in the loop in Case A grealer than, ess than, or equal to th magnetic ux in the loop in Case B at the instant sbown? Explain. MT11-CT2: MOVING RECTANGULAR LOOPS IN UNIFORM MAGNETIC FIELDS-MAGNETIC FLUX CHANGE In each case below, a rectangular loop of wire is moving to the right at 4 m/'s into a region with a uniform magnetic field pointing into the page. In Case B, the fieid is four times as strong as in Case A. The rectangular loops have different widths and heights, bat they are made from identical wires. At the instant shown, both loops are halfway into the uniform magnetic field regions. 18 cm Case A Case B Is the rate of change in magnetic flux in the loop in Case A greater than, less than, or equal to the rate of change in magnetic flux in the loop in Case B at the instant shown? Explain. 0 5

Explanation / Answer

Magnetic flux =B.A where B and A are vectors

Magnetic flux in case A=B×9×8×10^-4=72B×10^-4Tm^2

Magnetic flux in case B=4B×72×10^-4=288B×10^-4Tm^2

Magnetic flux in case A is less than the magnetic flux in case B

If a body covers 4m in 1s then it wil cover 9cm in 2.25×10^-2s

Case A Rate=Change in flux/time

=72B×10^-4/2.25×10^-2=32×10^-2weber/s

Case B

Change in flux /time

288B×10^-4/2.25×10^-2=128×10^-2weber/s

Rate of change in flux in case A is less than rate of change in flux in case B

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