CAPE Physics Unit 2 · 2014 · Paper 1 · Question Q14

What is the magnetic flux density at the end of a solenoid, given that the number of turns is 12 and the current passing is 3\text{ A}? (Assume \mu_0 = 4\pi \times 10^{-7}\text{ H m}^{-1}.)

1. (A)144\pi \times 10^{-7}\text{ T}
2. (B)1.44\pi \times 10^{-7}\text{ T}
3. (C)144\pi\mu\text{ T}
4. (D)144\pi\text{ T}