A wire is at right angles to a uniform magnetic field and carries an electric current. The wire is 120 mm in length.
When the current in the wire is increased by 5.0 A, the force acting on the wire increases by 4.8 × 10-3 N.
What is the magnetic flux density of the field?
8.0×10−6 T8.0 \times 10^{-6}\text{ T}8.0×10−6 T
8.0×10−3 T8.0 \times 10^{-3}\text{ T}8.0×10−3 T
1.3×102 T1.3 \times 10^2\text{ T}1.3×102 T
1.3×105 T1.3 \times 10^5\text{ T}1.3×105 T
66 exam-style questions on AQA A Level Physics Magnetic fields (A-level only), covering Magnetic flux density (A-level only), Moving charges in a magnetic field (A-level only), Magnetic flux and flux linkage (A-level only), Electromagnetic induction (A-level only), Alternating currents (A-level only), and The operation of a transformer (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.