i) leakage flux is those flux which goes through the air and linkage flux is those flux whose go through the cell.
ii)leakage flux is the loss at flux but linkage flu is warning flux.
iii)leakage flux is cause of eddy current loss and linkage flux is case of copper loss.
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by using an iron core
The magnetic leakage should be very small and designers go to some lengths to reduce it as far as possible because it causes leakage inductance, which is a bad thing. Ideally the magnetic field must be confined to the magnetic core of the transformer.
damper winding help to maintain the magnitude phase shift (on load chages) between rotor an stator flux and kill some parasite currents produced by the leakage flux moving out the rotor winding to the rotor core.
An opposing magnetic field around the motor coil.