CAPE Physics Unit 2 · 2011 · Paper 1 · Question Q12

A current-carrying conductor of mass 2.0 \times 10^{-3}\text{ kg} carrying a current of 2.0\text{ A} is balanced by a magnetic field at right angles to it. If the length of the conductor is 8.0\text{ cm}, the magnetic field strength is

1. (A)1.23 \times 10^{-5}\text{ T}
2. (B)1.23 \times 10^{-4}\text{ T}
3. (C)1.23 \times 10^{-1}\text{ T}
4. (D)1.23 \times 10^0\text{ T}