average emf question

[dream chaser]

Hi Guys,

For the VCE Physics Exam, when a question asks you to find the average emf, do we have to put a negative in front?

Thanks

[Tau]

Hi Guys,

For the VCE Physics Exam, when a question asks you to find the average emf, do we have to put a negative in front?

Thanks

I shouldn’t think so. The negative sign is due to Lenz’s law, specifying a direction. I’d assume VCAA would ask for the magnitude of induced EMF, or ask you to specify the direction separately.

[dream chaser]

Thanks. Also, do you know if for every question if we have to give the answer to the correct number of significant figures?

[Tau]

Thanks. Also, do you know if for every question if we have to give the answer to the correct number of significant figures?

As far as I understand they no longer take off marks really for sig figs. Rule of thumb to work with around 4, and quite to a reasonable amount, generally 2 to 4. There was one question last year where they /specified/ a specific number of sign figs, in which case you obviously had to follow that precisely.

Best of luck for the exam.

[dream chaser]

Thanks Tau for the reply and the wishes. I wish you the best of luck for your Specialist Exam tomorrow as well