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(a) How does the magnetic field (B) due ...

(a) How does the magnetic field (B) due to a straight conductor vary with distance (r) from it?
(b) How does the magnetic field (B) vary inside a solenoid?

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(a) B varies inversely as the distance (r) i.e. `Bprop1/r`.
(b) B is uniform inside a solenoid.
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