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NEET 2003 (AIPMT) · Ampere's Law, Cylinders, Solenoid & Toroid

Ampere's Law, Cylinders, Solenoid & Toroid question from NEET 2003 (AIPMT)

Q60NEET 2003 · AIPMTEasy

Ampere's Law, Cylinders, Solenoid & Toroid

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is

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Answer: (b)

$B = \mu_0 n I \propto nI$ .
$B' = \mu_0 \left(\dfrac{n}{2}\right)(2I) = B$ .
So the answer is (b) $B$ .

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