alleryStart learning →Where is the field of a current-carrying solenoid uniform, and where is it almost nothing?
AUniform outside, nearly zero just inside
BUniform at the ends, nearly zero midway
CUniform everywhere, and zero nowhere
DUniform inside, nearly zero just outside
Answer & Solution
Correct answer: D. Uniform inside, nearly zero just outside
1. A solenoid is a long coil of many turns, unlike a single flat loop.
2. Because of that shape, the field inside it is very uniform and also very strong.
3. The field just outside the coils is nearly zero.
4. Only near the ends does the interior field begin to weaken and change direction.
5. This is what makes solenoids useful when a large uniform field is needed over a large volume.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.9 Magnetic Fields Produced by Currents: Ampere's Law_
Keep practising Magnetism
Browse all Magnetism questions for B.Tech EEE, or explore more Electrical Engineering topics.
Related questions
For which task are x ray images more effective than MRI images?Which sensor, operating at liquid helium temperature, can measure fields thousands of timeWhat is a recording of the magnetic field of the beating heart called?What does functional MRI actually detect when it maps activity in the brain?Nuclear magnetic resonance was formulated in 1946. Who received the 1952 Nobel Prize in PhWhat is the largest part of an MRI unit, and what field strength does it typically produceHow is the electron beam of a cathode ray tube aimed at a chosen point on the screen?Wires of infinite length cannot be built. How is the definition of the ampere realised in