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How can you determine the wind direction by wetting your finger and holding it up in the air?
Wiki User
∙ 9y ago
You can determine wind direction by wetting your finger and holding it up in the air and feeling which side of your finger is being hit by the air. This would mean that the wind is coming from that direction.
Wiki User
∙ 9y ago
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Flemmings left Hand Rule?
Fleming's left hand rule for motors is a visual depiction used to determine direction of rotation in a motor. Extend your thumb, index finger and middle finger of your left hand at right angles to each other. The thumb represents direction of relative motion. The index finger represents direction of flux (magnetic field). The middle finger represents direction of current flow. A simple way of remembering what each digit represent is the phrase: "Martha's Fresh Cookies." M being motion, F being flux and C being current. Fleming's Right hand rule for generators is the same except you use your right hand and it applies to direction of rotation of generators.
How do you know that a force is negative or positive in relation to magnetic field?
It depends on what direction is considered positive and what direction is considered negative. For this case, I'll assume that up, right, and outward are positive and down, left, and inward are negative. Since the force is perpendicular to the magnetic field, the sign for the force depends on the direction of the current. If the current is inward and the magnetic field is to the left, then the force is upward and thus positive. If the current would be outward and the magnetic field would be still to the left, then the force is downward and thus is negative. The best way to think of this is to use the "right-hand" rule. Use your index finger to represent the direction of the current, your thumb as the direction of the force, and the other three fingers as the direction of the magnetic field direction.
Which rock would be scratched with the finger?
Sandstone
Show the reaction when cyanoacrylate is heated or mixed with sodium hydroxide?
It "fumes" aka vaporizes. This is used for finger printing mainly, known colloquially as the "finger print method".
What is the Biot-Savart Law?
The Biot-Savart Law describes the magnetic fields due to a steady current. It is a simplification of the more general Maxwell equations. The general equation is described in calculus: dB = u/(2*pi) * [(J dV) x r]/r_mag^3 dB = differential magnetic field, a vector, measured in (Teslas / meter) u = permeability of the medium the wire is in. In free space u = uo (4*pi*10^-7 Tesla * meters / Ampere) J dV = current density vector in a differential volume 'x' = cross product r = vector to where you want to calculate the magnetic field r_mag = magnitude of that vector (aka distance) If you are not familiar with calculus this equation may look rather difficult, but there are a couple of idealizations that simplify this calculation. 1) If our current is only 1 dimensional, the J becomes I (current). 2) By making the wire symmetric (either circular, straight, infinite, etc) we can get a much much much simpler closed form expression. For an infinitely long, straight piece of wire: B = u*I/(2*p*r) Teslas, r is the distance radially away from the wire. For a circular loop of wire: B = u*I/(2*R) Teslas, R is the radius of the circular loop. So enough of the mathmatics, lets talk about what the equations mean. The math says that magnetic fields arise from moving charges (current) and that the magnetic fields are circles around the wire. It also says that it points in a direction (which makes sense since magnetic fields are vector fields). That direction is given by the cross product of the direction the current is going, with the direction away from the wire. The result is a vector that rotates either clockwise or counterclockwise around the wire. I don't know if your familiar with the cross product, but the common way to picture what happens is to use three fingers, your middle finger, index finger, and your thumb. First make a fist, then point your thumb up, like a thumbs up. Then point your index away, like a pistol, and then make a right angle between your index and middle finger. All three fingers should be right angles with each other. This completely describes the cross product. The index is the first vector (in this case the current), the middle finger is the second vector (the direction of where you want to calculate the magnetic field), and your thumb is the result (the magnetic field). So a quick example is picture a wire flowing through your monitor. Point your index finger in this direction. Now you want to calculate the direction of the magnetic field at the top left corner of your screen. So make your middle finger point to the top left corner. The direction your thumb is point in is the direction of the magnetic field (it should be pointing at the top right corner). So I hope explained this well enough so you can calculate the field in some situations and can picture what the field looks like, all described by the Biot-Savart Law.
How can you determine wind direction by wetting your finger and hold it up into the air?
When you wet your finger and hold it in the air you can determine wind direction, if there is in fact wind, because the wind blows against your finger and chills the fluids on your finger. Therefore, whatever part of you finger is cold, in the direction the wind is coming from.
How many fingers are you holding?
you are holding 4 because a thumbs not a finger
What direction is your ring finger to the pinky finger?
sUTHARSAN LOVES JAANVI
What is the Ratio of middle finger to index finger?
holding your middle finger ang your index finger up at the same time means the middle finger in french!!
What is the purpose of Fleming's right hand rule?
Fleming's right hand rule is used to determine the direction of the magnetic force on a current-carrying conductor in a magnetic field. By aligning the thumb with the direction of current flow, the forefinger with the direction of the magnetic field, the middle finger points in the direction of the magnetic force acting on the conductor.
How do you determine the quality of legumes?
dip your finger in it
Flemmings left Hand Rule?
Fleming's left hand rule for motors is a visual depiction used to determine direction of rotation in a motor. Extend your thumb, index finger and middle finger of your left hand at right angles to each other. The thumb represents direction of relative motion. The index finger represents direction of flux (magnetic field). The middle finger represents direction of current flow. A simple way of remembering what each digit represent is the phrase: "Martha's Fresh Cookies." M being motion, F being flux and C being current. Fleming's Right hand rule for generators is the same except you use your right hand and it applies to direction of rotation of generators.
What is the significance of a child holding on to a finger?
the feeling of safety and closeness
How do roman gladiators surrendor?
A gladiator would surrender by stopping fighting and holding up one finger. If he wanted to be dramatic, he could get down on one knee and hold up the finger. At any rate, the raised finger was the signal that he was surrendering.A gladiator would surrender by stopping fighting and holding up one finger. If he wanted to be dramatic, he could get down on one knee and hold up the finger. At any rate, the raised finger was the signal that he was surrendering.A gladiator would surrender by stopping fighting and holding up one finger. If he wanted to be dramatic, he could get down on one knee and hold up the finger. At any rate, the raised finger was the signal that he was surrendering.A gladiator would surrender by stopping fighting and holding up one finger. If he wanted to be dramatic, he could get down on one knee and hold up the finger. At any rate, the raised finger was the signal that he was surrendering.A gladiator would surrender by stopping fighting and holding up one finger. If he wanted to be dramatic, he could get down on one knee and hold up the finger. At any rate, the raised finger was the signal that he was surrendering.A gladiator would surrender by stopping fighting and holding up one finger. If he wanted to be dramatic, he could get down on one knee and hold up the finger. At any rate, the raised finger was the signal that he was surrendering.A gladiator would surrender by stopping fighting and holding up one finger. If he wanted to be dramatic, he could get down on one knee and hold up the finger. At any rate, the raised finger was the signal that he was surrendering.A gladiator would surrender by stopping fighting and holding up one finger. If he wanted to be dramatic, he could get down on one knee and hold up the finger. At any rate, the raised finger was the signal that he was surrendering.A gladiator would surrender by stopping fighting and holding up one finger. If he wanted to be dramatic, he could get down on one knee and hold up the finger. At any rate, the raised finger was the signal that he was surrendering.
What is flaming left hand rule?
Stretch the thumb the first finger and the central finger of the left hand so that they are mutually perpendicular to each other. If the first four finger points in the direction of magnetic field the central finger points in the direction of current then the thumb points in the direction of motion of the conductor is known as fleming's left hand rule. by Prosenjit.
Does holding your finger under your nose make you stop sneezing?
Yes.
What kind of animal is a finger monkey?
Technically there is no finger monkey. IIt is a pygmy marmoset that most people think of when they mean a very small monkey holding its caretaker's finger.
