1- A circular coil of radius 40mm is found to produce a field 12.1×10^-6T at...

1- A circular coil of radius 40mm is found to produce a field 12.1×10^-6T at a point 30mm along it's axis.what is the electromagnetic moment?
2- An 8ohms loudspeaker is to be coupled to an audio amplifier of internal resistance 3.2 kilo-ohms.if the loudspeaker is connected accriss the secondary of the transformer , determine the turn ratio and reflected resistance in the primary circuit for maximum power transfer.
3- A shunt wound motor having an armature of 80turns and mean area 3.6×10^-2m^2 operates from a 12V supply and rotates in a constant magnetic field of 0.4T.when no load is attached and all fictional effects are neglected what is the rotational equilibrium speed?.?

In Physics
2 Answers Available
Asked by ameh on 21st February, 2019