Question

Hello guys


in a straight solenoid the magnetic fields are not confined as it have ends and so it have this flux = zero but in a toroid the magnetic fields are confined and also I don't have any end and some so it must produce electric flux but actually it doesn't produce any electric flux. why it is so ??​

Answer 1

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 dificulty is absent because it has no 'ends'.

hope it will help you dear ❣️

Answer 2

Answer:

The right, we immediately know that the field points in the positive z direction inside the solenoid, and in the negative z direction outside the solenoid. We see this by applying the right hand grip rule for the field around a wire.

The field inside a solenoid is strong and uniform. The small magnetic fields caused by the current in each coil add together to make a stronger overall magnetic field. Outside the solenoid, the small magnetic fields from each wire cancel each other out and the outside field is much weaker.

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