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January 29, 2015

January 29, 2015

Posted by **sarah** on Saturday, September 8, 2012 at 1:02am.

Find the magnitude of the EMF induced in the loop after exactly time 9.00s has passed since the circumference of the loop started to decrease.

- PHYSICS -
**Elena**, Saturday, September 8, 2012 at 4:23amL2=L1- (ΔL/Δt) •t=168-135=33 cm

EMF=-dΦ/dt =- d(B•A•cosα)/ dt.

cosα=1.

L1=2•π•R1

R1=L1/2•π=168/2•3.14=26.7 cm

A1=π•R1²=3.14•26.7²=2246 cm²=0.2246 m²

L2=2•π•R2

R2=L2/2•π=33/2•3.14=2.25 cm

A2=π•R2²=3.14•2.25²=86.7 cm²=0.0087m²

EMF=-dΦ/dt =- d(B•A•cosα)/dt.

cosα=1.

EMF=-B•ΔA/Δt=

= -1•(0.2246-0.0087)/9=0.024 V

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