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## Homework Statement

A child sleeps at an average distance of 30cm from household wiring. The mains supply is 240V r.m.s. Calculate the max possible magnetic flux density in the region of child when the wire is transmitting 3.6 kW of power.

Thats the first part. I don't really understand what r.m.s is and how to convert it to normal V..

## Homework Equations

VI=P

F=BIL

## The Attempt at a Solution

B= (P U0) / (V 2pi r)

= (3.5 * 10^3)(4pi * 10^ -7) / (240 2pi (0.3))

Getting 9.7 * 10 - 2 - not correct.