the field inside a long circular coil carrying current will be parallel straight lines.explain withthe help of a figure.

Asked by mrinalchatterjee | 25th Sep, 2010, 11:48: AM

Expert Answer:

(Blue lines represent coils.)
A large field is produced parallel to the axis of the coils (in the z-direction in figure ). Components of the magnetic field in other directions are cancelled by opposing fields from neighbouring coils. Outside the solenoid the field is also very weak due to this cancellation effect and for a solenoid which is long in comparison to its diameter, the field is very close to zero. Inside the solenoid the fields from individual coils add together to form a very strong field along the axis.

Answered by  | 25th Sep, 2010, 06:28: PM

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