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Magnets and magnetic fields

Magnets and magnetic fields

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Question 1

A solenoid of length L L\,L has N N\,N turns of wire of resistance R R\,R wound around a core. When connected to a direct current (DC) power supply of constant potential difference V V\,V and negligible internal resistance, a magnetic field of flux density B B\,B is established at its centre.

The solenoid is replaced by a new solenoid with twice the length (2L) and twice the number of turns (2N) made from the same type of wire (with the same cross-sectional radius of the turns). This new solenoid is connected to the same power supply VVV.

What is the magnetic flux density at the centre of the new solenoid?

A

0.25B0.25 B0.25B

B

0.50B0.50 B0.50B

C

1.0B1.0 B1.0B

D

2.0B2.0 B2.0B

Markscheme

Magnets and magnetic fields Questions

  1. GCSE
  2. /Physics
  3. /Magnets and magnetic fields

17 exam-style questions on OCR GCSE Physics Magnets and magnetic fields. Each one has a worked solution and a mark scheme showing where the marks go.

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