A 250-turn coil of area rotates uniformly at in a uniform magnetic field of

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

Problem

A 250-turn coil of area

0.030\,\text{m}^2

rotates uniformly at

3000\,\text{rev}\,\text{min}^{-1}

in a uniform magnetic field of

0.20\,\text{T}

. The coil is connected to a

50\,\Omega

resistor. Neglecting all other resistances, determine the average electrical power dissipated in the resistor. (a)

1.8\,\text{kW}

(b)

2.2\,\text{kW}

(c)

4.4\,\text{kW}

(d)

1.1\,\text{kW}