4. (a) Figure A shows two tops spinning about their central axis (the dotted lin

Question

4. (a) Figure A shows two tops spinning about their central axis (the dotted line). Suppose both spin at the same rate and that the left most top has central axis vertical while the right top does not. Describe the difference in motion between the two tops. Figure A. (b) What is the difference between the motion of a current carrying coil in a magnetic field, see figure B, and the motion of the electron (which is always "spinning") in the magnetic field? magnetic field coil with current, in horseshoe magnet axis of rotation orientation of electron's magnet

Explanation / Answer

1) The ist top is simply rotating about central vertical axis but second top is precessing about this axis.Precession is a change in the orientation of the rotational axis of a rotating body.So it will have angular velocity as well as spin velocity.but the ist top has only angular velocity.

2)The force on current carrying coil will be perpendicular to the diretion of current and that of magnetic fiels so the motion will be along the force. But in case of electrons the motion will be spiral or linear depending on the way electron ir projected into the maagnetic field.

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