MAGNETISM and INDUCTION

1. 
   where F is the force experienced by a conductor carrying a current I in a field of magnetic flux density B.
2. 
   where F is the force experience by a charge q moving with velocity v in a field of magnetic flux density B.
3. 
   used to find the radius, r, of the circular orbit of a charge q, mass m, moving with velocity v in a B-field.
4. 
   where  is the magnetic flux threading an area A at right angles to a field of magnetic flux density B.
5. Faraday’s Law of Electromagnetic Induction
   
   where E is the average induced e.m.f.,  and  the initial and final magnetic flux respectively, and t is the time taken for the change in magnetic flux.
   (Note: if a coil has N turns, then this value has to be multiplied by N to get the total induced e.m.f.)
6. Faraday’s Law of Electromagnetic Induction
   
7. 
   relates the r.m.s. and peak values of a.c.
8. 
   relates the r.m.s. and peak values of an a.c. voltage.
9. 
   the power, P, developed by an a.c. is equal to the product of the r.m.s. values of potential difference and of current.
10. 
    the power developed by an a.c. is equal to the square of the r.m.s. value of the current multiplied by the resistance through which it flows.
11. 
    The ratio of the voltage across the primary to the voltage across the secondary coil of a transformer is equal to the ratio of the number of turns in the primary to the number of turns in the secondary.
    (Note: But )