q = − e) the force component will be oriented towards positive y axis.ĭo you have to be a physical object to measure flux?įlux doesn’t have to be a physical object - you can measure the “pulling force” exerted by a field. If the particle is negatively charged (e.g. q = e) it will have a force component oriented towards the negative y axis as in the formula above and as in your figure. If the particle is positively charged (e.g. What’s the difference between a positive and negative particle?
Your vector calculus math life will be so much better once you understand flux. The total flux depends on strength of the field, the size of the surface it passes through, and their orientation. What’s the difference between flux and total flux?įlux is the amount of “something” (electric field, bananas, whatever you want) passing through a surface. It is related to the north and south pole of a magnet and direction of its magnetic lines of force. The flux is positive when it is building up and negative going back. I believe the positive flux indicates the direction of the magnetic field and the negative flux is where it is going. What is the relationship between positive and negative flux? The magnitude is never less than zero by definition, and it doesn’t generally make sense to try to label some directions as “positive” and some as “negative”, as it does for a one-dimensional vector (with only two possible directions). What is inward flux?įor a closed surface (a surface with no holes), the orientation of the surface is generally defined such that flux flowing from inside to outside counts as positive, outward flux, while flux from the outside to the inside counts as negative, inward flux. Thus, equate this equation to zero and find the angle between the plane of the coil and lines of force. Magnetic flux through a coil is maximum when it is equal to zero. But if = 0, the flux will necessarily be zero. Magnetic field may or may not be zero if magnetic flux θ B = 0 as positive flux may be equal to negative flux.
What is positive and negative magnetic flux?įor a body present in a field (uniform as well as nonuniform), outward flux is taken to be positive while inward flux is taken to be negative.
In vector calculus flux is a scalar quantity, defined as the surface integral of the perpendicular component of a vector field over a surface. Does flux have direction?įor transport phenomena, flux is a vector quantity, describing the magnitude and direction of the flow of a substance or property. Typically in this case we define “outward” flux to be positive, in which case the total electric flux through the surface will be a positive number since the electric field lines point out of a positively charged particle. The magnetic flux is the net number of field lines passing through that surface that is, the number passing through in one direction minus the number passing through in the other direction (see below for deciding in which direction the field lines carry a positive sign and in which they carry a negative sign). What do you understand by positive magnetic flux? So, if you move a bar magnet towards a conducting loop such that the magnetic flux associated with the loop surface increases, there will be an induced current( whose direction is given by the red arrow ) whose magnetic field opposes the increase in magnetic flux. What is the meaning of negative magnetic flux? When electric lines emerge out of surface, the electric flux is positive and when those lines enter into a surface, the electric flux in negative. Yes, electric flux can be a negative number. When the field vectors are going the opposite direction as the vectors normal to the surface, the flux is negative.When the field vectors are going the same direction as the vectors normal to the surface, the flux is positive.How do you know if flux is positive or negative? 8 What’s the difference between a positive and negative particle?.7 What’s the difference between flux and total flux?.1 How do you know if flux is positive or negative?.
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