Question

According to Maxwell, a changing electric field produces (A) emf (B) radiation pressure (C) electric current (D) magnetic field

Short answer

The correct answer is (D) magnetic field. According to Maxwell's Equations, specifically Faraday's Law, a changing electric field produces a magnetic field.

Step-by-step solution

Recall Maxwell's Equations

Maxwell's Equations are a set of four fundamental equations that describe the behavior of electric and magnetic fields. In this problem, we focus on the equation that relates a changing electric field to the phenomenon it creates.

Identify the Correct Option

According to the third equation of Maxwell (Faraday's Law), a changing electric field produces a magnetic field. Faraday's Law states that the induced electromotive force (EMF) in a closed loop is equal to the rate of change of the magnetic flux through the loop. Mathematically, this can be written as: \( -\frac{d\Phi_B}{dt} = EMF \) Where \(\Phi_B\) is the magnetic flux and t is the time. Now, we look through the given options and match the one that aligns with our understanding of Maxwell's Law: (A) emf - This is the result of a changing magnetic field, not a changing electric field. (B) radiation pressure - This is related to the interaction of electromagnetic waves and matter, not directly to the changing electric field itself. (C) electric current - This can be a result of the induced EMF due to a changing magnetic field, but not directly due to a changing electric field. (D) magnetic field - This is the correct option since a changing electric field produces a magnetic field according to Faraday's Law (part of Maxwell's Equations). The correct answer is (D) magnetic field.