The magnitude of the magnetic field for that wave at p is 1.9 x 10⁻⁶ T.
An electromagnetic wave consists of an electric field, defined as usual in terms of the force per charge on a stationary charge, and a magnetic field, defined in terms of the force per charge on a moving charge.
B = E/c
where;
B = 570/(3 x 10⁸)
B = 1.9 x 10⁻⁶ T
Thus, the magnitude of the magnetic field for that wave at p is 1.9 x 10⁻⁶ T.
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