For definition of a vector of magnetic induction find its absolute value and the direction. It can be done by means of a reference magnetic needle and the solenoid. In the solenoid calculate value of magnetic induction, and find its direction by means of a magnetic needle. By the rule of the gimlet there is a direction of the field of direct current and a round with current.
It is required to you
- thin magnetic needle, solenoid, ampermeter, right gimlet.
Instruction
1. A vector of magnetic induction of the direct conductor with a tokomsoberita a chain from the ampermeter and the direct conductor, connect it to a current source. Define a space point where induction of magnetic field will be measured, and measure distance from it to the conductor. For this purpose lower on it a perpendicular and measure its length in meters. Connect a source of current and measure current in a chain by means of the ampermeter in amperes. Find value of magnetic induction, having divided current into distance from the chosen point to the conductor and number 6.28, and multiply result by a magnetic constant 1.26•10^ (-6), B=I•1.26•10^ (-6) / (R•6.28). Then take the right gimlet (the usual corkscrew will approach) and begin to twist it in the direction of the movement of current which is by agreement directed from a positive pole of a source to negative. The movement of the handle of the gimlet will show the direction of power lines of the field, and the vector constructed on a tangent and will show the direction of magnetic induction.
2. A vector of magnetic induction of a round with a tokomsoberita a chain from a round of the conductor which represents a circle with the known radius and the ampermeter. Connect a chain to a source of current and measure its force in amperes. Define induction in the center of a round, having increased value of current by 1.26•10^ (-6) and having divided into the doubled value of radius of a round in meters of B=I•1.26•10^ (-6) / (R•2). Rotate the gimlet handle in the direction of circular current, and its progress will show the direction of a vector of magnetic induction in the center of a round.
3. A vector of magnetic induction weeding a solenoidarasschitayta magnetic induction of the solenoid. For this purpose measure its length in meters and count quantity of rounds in the coil. Collect a chain with the solenoid and the ampermeter, having connected it to a current source. Increase value of current by quantity of rounds and number 1.26 • 10^(-6), and divide result into solenoid length. It will also be value of induction in the solenoid. Establish a magnetic needle at one of solenoid faces, its northern (blue) end will show the direction of a vector of induction in the solenoid.