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Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. Why?

prasanjeet kumar , 11 Years ago
Grade 8
anser 2 Answers
Himanshu khare

Last Activity: 8 Years ago

if the lines were entirety confined between the two ends of a straight solenoid the flux through the cross section at each end would be non zero. For a toroid this difficulty is absent because it has no ends
Rohit singh

Last Activity: 7 Years ago

Magnetic field lines can be entirely confined within the core of a toroid, because it has no ends.
 
If field lines were entirely confined between two ends of a straight  solenoid, the flux through the cross-section at each end would be non-zero. But the flux of field B through any closed surface must always be zero. For a toroid, this difficulty is absent because it 
has no ends.
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