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How can you calculate change in magnetic flux? 
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#1
Apr305, 11:19 PM

P: 80

Here is the problem
A long and narrow rectangular loop of wire is moving toward the bottom of the page with a speed of 0.020m/s (see the drawing). The loop is leaving a region in which a 2.4T magnetic field exists; the magnetic field outside this region is zero. During a time of 2.0s, what is the magnitude of the change in the magnetic flux? Please help me.. how do I do this? 


#2
Apr305, 11:51 PM

P: 40

Since the magnetic flux is completely perpendicular to the loop, the magnetic flux at anytime is B*A, where A is only the area that is within the magnetic field.
Magnetic flux = B*A you can differentiate this equation with respect to time to find the rate of change of flux, and relate dA/dt to the information given in the question. Because you are looking for the change only, you do not need to the know the total area, or the length, of the loop. 


#3
Apr405, 09:00 PM

P: 80

is there a way to do it without involving calculus :)?



#4
Apr405, 09:06 PM

Sci Advisor
HW Helper
P: 11,896

How can you calculate change in magnetic flux?
You can do it,if the velocity is constant...(I think it is).
So yes. [tex] \Delta \Phi =B \Delta A [/tex] What is the variation of the area...? Daniel. 


#5
Apr505, 01:38 AM

P: 80

thanks :)
are the units for magnetic flux Tm^2 (the SI unit) 


#6
Apr505, 05:50 AM

Sci Advisor
HW Helper
P: 11,896

1 Tm^2 is equal to one 1 Weber.
Daniel. 


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