Solve problems in d.c. circuits (S1 2017) Sample Test Question 1

Calculate B if A=0.05 in.² and Φ= 1000 μWb.

(Hint: - 39.37 in. = 1 m)

Solution Where; B= Φ/A B= Flux Density Φ = Flux, unit must be in wb(weber) A = area in m2

Given;

A = 0.05 m²  (1inch=25.4mm=0.0254m)

A=0.05 m² =0.05 x 0.0254² =32.2 x 10^-5m²

Now;

B=1000x10^-6/3.2x10^-5

=31.25T (where T is tesla)