PHYS Lecture Notes - Lecture 4: Central Board Of Secondary Education, Solenoid, Galvanometer
31 Mar 2023
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Chapter-04: moving charges and magnetism: force on a straight conductor: Force f on a straight conductor of length l and carrying a steady current i placed in a uniform external magnetic field b, (cid:1)(cid:2) (cid:2) (cid:1)(cid:2) Force on a charge q moving with velocity v in the presence of magnetic and electric fields. Bf (cid:2) (cid:1)(cid:2) q vxb (cid:1)(cid:2) is normal to v and work done by it is zero. A charge q executes a circular orbit in a plane normal with frequency called the cyclotron frequency given by, v c qb m . This cyclotron frequency is independent of the particle"s speed and radius: biot savart law: (cid:1)(cid:2) It asserts that the magnetic field d b (cid:2) due to an element dl carrying a steady current i at a point p at a distance r from the current element is, (cid:1)(cid:2) d b. 3 r: magnetic field due to circular coil:
