Question

1. The magnetic field at the earth's surface can vary in response to solar activity. During one intense solar storm, the vertical component of the magnetic field changed by 2.8 μT per minute, causing voltage spikes in large loops of the power grid that knocked out power in parts of Canada.

Part A)

What emf is induced in a square 110 km on a side by this rate of change of field?

2.What is the magnetic field amplitude of an electromagnetic wave whose electric field amplitude is 50

V/m ?

Answer 1

Hello!

Youre required solution is as follows!

1) We know that,

This gives,   

This comes to around -564.7 volts emf will be induced

2) Taking the energy density of magnetic and elecric fields and equating them, we have

  

=   

now, B =

but,

where c = speed of light

B = E/c =  

Tesla

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