A student has a magnet with a magnetic flux density of 85 mT85\ \text{mT}85 mT between its poles.
A 4.0 cm length of wire is placed in the magnetic field, at right angles to the field.
The force on the wire is 0.017 N.
Calculate the current in the wire.
Use the equation
F=B×I×lF = B \times I \times lF=B×I×l
The student wants to double the force on the wire without changing the current or the magnet.
State the change the student should make.
Give a reason for your answer.
Show that 1 T1\ \text{T}1 T is equal to 1 N/A m.
86 exam-style questions on Edexcel GCSE Physics 12.3 The motor effect, covering 12.3.1 The motor effect, 12.3.2 Fleming's left-hand rule, 12.3.3 Force on a conductor, and 12.3.4 Electric motors. Each one has a worked solution and a mark scheme showing where the marks go.