12-14-2018, 06:04 PM
hi,
i'd like to use phyphox to verify Biot-Savart law and magnitude of the magnetic field inside a coil with my kids (last year of high school, 19 years old).
I run into some issues:
-i try to set my phone in a certain position in order to have no component of the earth field along a certain direction, for example x axe, so I put it with y axe along a compass needle but i can never see it measuring 0μT. The direction assumed by the phone when the x component of B is 0 is about 25 degrees different from the compass needle one. Is it because of the phone magnetic field?
-when a DC current (0,45/1,4A) flows, an extra B is visible: it changes up to 34, 35 μT, visible enough on the x window, but it's oscillating and not constant. I really don't know why.
[attachment=17]
in this screenshot I tried with 3V, 6V and 9V and a resistor of 2,5 ohm
any hint?
thank you
i'd like to use phyphox to verify Biot-Savart law and magnitude of the magnetic field inside a coil with my kids (last year of high school, 19 years old).
I run into some issues:
-i try to set my phone in a certain position in order to have no component of the earth field along a certain direction, for example x axe, so I put it with y axe along a compass needle but i can never see it measuring 0μT. The direction assumed by the phone when the x component of B is 0 is about 25 degrees different from the compass needle one. Is it because of the phone magnetic field?
-when a DC current (0,45/1,4A) flows, an extra B is visible: it changes up to 34, 35 μT, visible enough on the x window, but it's oscillating and not constant. I really don't know why.
[attachment=17]
in this screenshot I tried with 3V, 6V and 9V and a resistor of 2,5 ohm
any hint?
thank you