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Electromagnetism — Question 232

Original QCE Vault practice · 5 marks

Q232 · Practice questionComplex familiar5 marks

QUESTION 232 (5 marks)

A long air-core solenoid of length

0.300\,\mathrm m

carries

1.20\,\mathrm A

and produces an internal field of

4.00\,\mathrm{mT}

. Use

\mu_0=4\pi\times10^{-7}\,\mathrm{T\,m\,A^{-1}}

and neglect end effects.

a)

Estimate the number of turns.

[3 marks]

b)

The same coil is shortened uniformly to

0.240\,\mathrm m

without changing its turn count, and the current is reduced to

0.600\,\mathrm A

. Determine the new internal field.

[2 marks]

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