Magnetism
Check that the ratio $$ke^2$$ /G $$m_e\,m_p$$ is dimensionless. Look up a Table of Physical Constants and determine the value of this ratio. What does the ratio signify?
State two evidences of the existence of earths magnetic field.
The two evidences of the existence of earth’s magnetic field are:
1. When a magnetic needle is suspended freely, it always comes to rest in the north-south direction.
2. In order to obtain neutral points, field lines of a magnet can be plotted.
Check that the ratio $$ke^2$$ /G $$m_e\,m_p$$ is dimensionless. Look up a Table of Physical Constants and determine the value of this ratio. What does the ratio signify?
The ratio of the electrostatic force of attraction to the gravitational force between the proton and electron of the hydrogen atom is of the order of
Two particles each of mass $$m$$ and carrying charge $$Q$$ are separated by some distance. If they are in equilibrium under mutual gravitational and electrostatic forces, then Q/m (in C/Kg) is of the order of:
The ratio of electric force to the gravitational force between two protons separated by a finite distance is of the order of:
How can magnetic properties of a magnet be destroyed?
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet.
What is the unique property shown by the charge of an oil drop?