ERICA said:
why electric field is zero in non-resistive part but non-zero in resistive part?
and why whenever a p.d is applied, there is an electric field?
Don't worry about the newsgroup grumps ... these are good questions but
maybe there is a more educational oriented newsgroup ... think about the
current flowing through a perfect wire (i.e. zero resistance) ... there is
no voltage drop. Technically there would be a field according to right hand
rule encircling the wire ... with a resistive component you will be
resisting the flow which removes energy from the system in the form of heat.
You need to get a good book on electronics and look at the math equations
for RC and LRC circuits. Have you ever built an electromagnet? That will
be the best intuitive explanation of this physics effect ... take a heavy
iron nail and wrap it tightly with copper wire. Attach both ends of the
wire to a battery and you can lift at least paper clips.
Ed