do we consider the negative sign for lenz's law with graph problems??? (1 Viewer)

[anonymoushehe]

I got A which is what the answer said, but i was just a bit iffy cause I approached the question by considering the fact that the gradient gives the rate of change in magnetic flux, and since there is only one coil, N =1. So the induced emf would be -gradient of the curve. I graphed out the derivative of the original graph, and flipped it about the x axis, but none of the answers matched except for the first one which was not flipped about the x axis? So do we just ignore the negative sign of the induced emf equation or?

 

[wizzkids]

The sign in Lenz's Law is not decisive in this question.
Look more closely at the diagram.

• The current is measured by a galvanometer in series with the circuit.
• The polarity of the galvanometer is not shown on the diagram.
• Therefore, the direction of the current through the loop is not absolutely defined.
• Select the graph that shows two current impulses with opposite directions, i.e. (A)

 

[anonymoushehe]

The sign in Lenz's Law is not decisive in this question.
Look more closely at the diagram.

• The current is measured by a galvanometer in series with the circuit.
• The polarity of the galvanometer is not shown on the diagram.
• Therefore, the direction of the current through the loop is not absolutely defined.
• Select the graph that shows two current impulses with opposite directions, i.e. (A)

oh so can you define whatever direction as positive for current?

 

[C2H6O]

oh so can you define whatever direction as positive for current?

This q is more so testing that you can recognise that the 2 emfs produced will be in opposite directions. The direction of the current doesn't matter in this question because we don't know which way the galvanometer is wired

 

[anonymoushehe]

This q is more so testing that you can recognise that the 2 emfs produced will be in opposite directions. The direction of the current doesn't matter in this question because we don't know which way the galvanometer is wired

ohh okayy