Which conductor has greatest magnitude of current in the given diagram in picture? Please answer :)?
Total or Net current is equal to the net charge that passes through a point in a unit time. I arbitrarily pick as my convention that: 1) negative charge move to the left or positive charge move right will have a positive value of current 2) a negative charge moving to the right or a positive charge moving to the left as having a negative current P) 2 negative charges moving left and 0 positive charges => +2 net negative charges moving to the left. current: +2 Q) 3 negative charges moving left: +3 2 positive charges moving right+ +2 but the two charges at the top, the - and +, pass each other, so they cancel so you are left with 2 negative leaving the area to the left and 1 positive to the right. Net Current: +2 + 1 = +3 R) 4 positive net charges moving right current: 0+(+4) = +4 S) 3 negative charges moving left: +3 2 positive charges moving right:+2 This is different from Q because in S the negative charges and the positive charges leave the area and don't pass each other as in Q. net = +5 Most is S. Least is P
Determine the magnitude and direction of the magnetic field of point a and b.?
Figure P30.21 is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, which is surrounded by an outer conductor, which is surrounded by another rubber layer. In a particular application, the current in the inner conductor is I1 = 1.04 A out of the monitor, and the current in the outer conductor is I2 = 3.02 A into the monitor. http://www.physics.otago.ac.nz/PHSI131/manson/131_Hmwk_Qs_9_PJM_04.pdf Determine the magnitude and direction of the magnetic field at point a. Determine the magnitude and direction of the magnetic field at point b
The figure below represents a section of a circular conductor of nonuniform diameter carrying a current of I =?
The figure: http://tinypic.com/r/vxnh2g/7 The figure above represents a section of a circular conductor of nonuniform diameter carrying a current of I = 4.50 A. The radius of cross-section A1 is r1 = 0.240 cm. (a) What is the magnitude of the current density across A1? A/m2 The radius r2 at A2 is larger than the radius r1 at A1. (b) Is the current at A2 larger, smaller, or the same? The current is larger. The current is smaller. The current is the same. (c) Is the current density at A2 larger, smaller, or the same? The current density is larger. The current density is smaller. The current density is the same. Assume A2 = 2A1. (d) Specify the radius at A2. mm (e) Specify the current at A2. A (f) Specify the current density at A2. A/m2
What is the magnitude of current?
Current, measured in Amperes (A), has the symbol "I" ('eye') and is equal to the charge (Coulombs, C) per unit time (Seconds, s). In other words, it is the number of electrons passing a point per second. I = Q/t Where Q is charge and t is timeCurrent is also equal to the potential difference (voltage, V) across a component over the resistance (ohms) of the componentI = V/R
Is current a scalar or a vector quantity?
Hello :)Electric current is a SCALAR quantity! Sure it has magnitude and direction, but it still is a scalar quantity!Confusing? Let us see why it is not a vector.First let us define a vector! A physical quantity having both magnitude and a specific direction is a vector quantity. Is that all? No! This definition is incomplete! A vector quantity also follows the triangle law of vector addition.Let us understand that with a simple example! Say you are at home right now! From there you go to school and then you go shopping to some supermarket. So now you have moved from points A to B to C! Now when you come back home again, what is your net displacement? Its zero, because in the real sense of the word displacement, you went nowhere! You are still at your initial position! So now, net result along the path A-B-C-A is zero! This is the triangle law of vector addition!Now consider a triangular loop in an electric circuit with vertices A,B and C. The current flows from A→ B, B→C and C→A. Now had current been a vector quantity, following the triangle law of vector addition, the net current in the loop should have been zero! But that is not the case, right? You wont be having a very pleasant experience if you touch an exposed high current loop :PSo that is why, electric current is a scalar quantity! If I have made any mistakes, please feel free to correct me :)
You have 2 balls with identical diameter and weight. One is solid, one is hollow. You can't tell by knocking on them. How can you find the solid one?
Identical in diameter and weight?If they’re the same dimensions, and weigh the same, yet one is hollow, and another isn’t, I can only assume they’re made of different materials. I might be wrong, but I don’t think that two things can be the same dimensions and weight, without also being the same material.So the ball made up of the more-dense material is the hollow one. (because the less dense material has to be full to equal the weight of the more dense one, which requires less material)But, I can think of some other things to try if you can’t discern the material:Drop themI would imagine the hollow one will bounce higher than the solid one. Or maybe it’s the other way around. one of them will bounce higher than the other.(don’t) Put them in waterSame diameter, same weight, but one of them is hollow. So they can’t have the same density, right? Don’t things that are less dense float higher than ones that are more dense?if they both sink to the bottom, then I would look at the rate at which they sink. The one that’s hollow would presumably have air in it, so it would sink more slowly.Maybe experiment with a few different fluids. There’s some sort of name for this principle. For the life of me I forget.User-13466511401027466231 rightly points out that at the same dimensions and weight, they have the same average density. That means they’ll float at the same point in any fluid.Use PhysicsApparently there’s a lot of physicists on Quora that have some fun mathy ways to solve this, too.
A resistor of 6 ohms is connected in a series with another resistor of 4 ohms. A potential difference of 20 V is applied across the combination. What is the current in the circuit and the potential difference across the 6 ohms resistor?
In series, the total resistance is 10 ohms. Using Ohm’s law, V = IR, I = V/R, and I = 20/10 = 2AThe 20V is divided among the resistors in an inverse proportion, with the lower resistance dissipating more power and therefore more voltage (since the current through both resistors is the same). But since we already know how much current is passing through the 6 ohm resistor (2A), we can just use Ohm’s law again.V = IR … V=2*6 = 12V
What is the definition of magnitude in physics?
Magnitude is a property much like volume or area but is generally concerning a vector quantity.So, I bet you’re asking what is a vector? Well, you have come to the right place: A vector is something that has magnitude and direction.For example, a vector could be displacement. Now if you’re not someone who is experienced with these terms, let me explain.Imagine you’re in a race and you’re at the starting line, if you run 100m your displacement is 100m away from that line. Then if you run 120m back your displacement is -20m (as you’re now behind that line). However, displacement is different to distance as distance is not a vector it is scalar. A scalar quantity has magnitude but not direction.Notice, because in the example you ran backwards, your direction was taken into account when talking about displacement. If we were talking about distance we would say you ran 220m (as you ran 100m + 120m in total, which is the magnitude of the distance travelled) and the direction you were travelling in that time is irrelevant as it is scalar and doesn’t have a direction.Things such as temperature, volume, area all have magnitude (they are either great or small) but don’t have a direction!Hope that helps!