A generator must supply an rms emf of at

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A generator must supply an rms emf of

220\,\text{V}

25\,\text{rev}\,\text{s}^{-1}

. The coil has 100 turns, each of area

0.050\,\text{m}^2

. What uniform magnetic field strength is required? (a)

0.56\,\text{T}

(b)

0.40\,\text{T}

(c)

0.28\,\text{T}

(d)

0.80\,\text{T}