Correctly to define a vector of magnetic induction it is necessary to learn not only its absolute value, but also the direction. The absolute value is defined at measurement of interaction of bodies by magnetic field, and the direction - on the nature of motion of bodies and special rules.
It is required to you
- - conductor;
- - current source;
- - solenoid;
- - right gimlet.
Instruction
1. Find a vector of magnetic induction of the conductor with current. For this purpose connect it to a current source. Passing current through the conductor, by means of a tester find its size in amperes. Decide on a point where induction of magnetic field will be measured, from this point lower a perpendicular on the conductor and find its length R. Find the module of a vector of magnetic induction in this point. For this purpose increase value of current of I by a magnetic constant μ ≈ 1.26•10^ (-6). Result divide into perpendicular length in meters, and the doubled number π ≈ 3.14, B=I•μ / (R·2 · π). It is an absolute value of a vector of magnetic induction.
2. To find the direction of a vector of magnetic induction, take the right gimlet. The usual corkscrew will approach. Arrange it so that the rod went parallel to the conductor. Begin to rotate the gimlet so that its rod began to move in the same direction, as current. Rotation of a handle will show the direction of lines of magnetic field.
3. Find a vector of magnetic induction of a round of a wire with current. For this purpose measure current in a round by a tester and round radius by means of a ruler. To find the module of magnetic induction in a round, increase the current of I by a magnetic constant μ ≈ 1.26•10^ (-6). Divide the received result into the doubled radius of R, B=I•μ / (2•R).
4. Define the direction of a vector of magnetic induction. For this purpose install the right gimlet by a rod in the center of a round. Begin to rotate it in the direction of current in it. Progress of a rod will show the direction of a vector of magnetic induction.
5. Calculate magnetic induction in the solenoid. For this purpose count quantity of its rounds and length which previously express in meters. Connect the solenoid to a source and measure by a tester current. Calculate induction of magnetic field in the solenoid, having increased the current of I on quantity of rounds N and a magnetic constant μ ≈ 1.26•10^ (-6). Divide result into length of solenoid of L, B=N•I•μ/L. Define the direction of a vector of magnetic induction in the solenoid as well as in a case with one round of the conductor.