A proton takes `10^(-12)s` to complete one revolution in uniform magnetic field. The time taken in another orbit of double the radius in the same field is
A. `0.5xx10^(-12)sec`
B. `2xx10^(-12)sec`
C. `4xx10^(-12)sec`
D. `10^(-12)sec`
i. Density of lines of force i.e., the number of lines of force per unit area around a particular point determines the strength of the magnetic field at that point.
ii....
i. Magnetic axis: The Earth is considered to be a huge magnetic dipole. The straight line joining the two poles is called the magnetic axis.
ii. Magnetic equator: A great circle in...