For definition of induction of magnetic field take the special device which is called teslametr, having brought it in the field, take readings. To find magnetic field of the solenoid, measure its length and quantity of rounds and also force of the current passed through it then calculate induction. It is also possible to measure this size by a reference magnet.
It is required to you
- For measurements take teslametr, the solenoid, the ampermeter, a magnetic needle, a dynamometer.
Instruction
1. Definition of induction of the field teslametry Take the sensor of a teslametr and bring it in the necessary point of space where induction of magnetic field is measured. On a scale or the screen of the device the numerical value of this size will appear.
2. Measurement of induction by means of the conductor with current Collect the chain consisting of the direct conductor suspended on flexible conductors and the ampermeter which is consistently connected to it. Measure its length and place the conductor between magnet poles, connect a chain to a current source. The magnetic force which counterbalance with a dynamometer will begin to affect the conductor, having taken from it readings in newtons. Take readings of current in amperes by means of the ampermeter. Consistently divide value of magnetic force into the current and length of the conductor in meters (B=F / (I•l)), as a result receive value of induction of the field in teslas.
3. Measurement of induction of the field of the solenoid Take the coil from the isolated wire, rather long in order that power lines of the field in it were straight lines. Measure its length and count quantity of rounds of a wire. Connect the solenoid to a current source, having turned on in a chain consistently the ampermeter. By means of the ampermeter learn force of the current passing through the solenoid in amperes. After that increase value of current by quantity of rounds of the solenoid and divide into its length in meters (I · n/l). Increase result by number 1.26*10^-6, receive value of magnetic induction of the field of the solenoid in teslas.
4. Measurement of induction of the field a reference magnet For a reference magnet take a long and thin magnetic needle and suspend it on thread of a tortional dynamometer. Bring a system in magnetic field, and rotate a dynamometer until the arrow does not move a little. Take readings from a dynamometer. Then bring an arrow to a face of the solenoid and, regulating current, achieve that at a balance way out at rotation, on a dynamometer there were same indications. Calculate induction of the field of the solenoid, it will be equal to induction of the measured field.