Physics
Name the material of the core in (a) an electric bell, (b) electromagnet, (c) a d.c. motor, (d) an a.c. generator, and (e) a transformer.
Related Questions
How are the e.m.f. in the primary and secondary coils of a transformer related with the number of turns in these coils?
Complete the following sentences —
(i) In a step up transformer, the number of turns in the primary are ….. than the number of turns in the secondary.
(ii) The transformer is used in ………….. current circuits.
(iii) In a transformer, the frequency of a.c. voltage ……… (increase / decreases / remains same)
State Faraday's laws of electromagnetic induction.
State two factor on which the magnitude of induced e.m.f in a coil depend.