Consider the following statements regarding Poynting Vector:1.Poynting vector represents power flow per unit area in electromagnetic field.2.It is given by the cross product of electric and magnetic field vectors.3.Direction of Poynting vector indicates direction of energy propagation.4.It has units of volts per meter.Which of the above statements is/are correct?

Correct Answer: C - 1, 2 and 3 only

Quick Concept Explanation

The Poynting vector gives electromagnetic power-flow density and points in the direction of energy transport for a propagating wave. It is the cross product of electric and magnetic fields. Key relation: S=E×H [W/m²].

Exam focus: Cross E with H to get energy-flow direction. Common trap: V/m is electric-field unit, not Poynting-vector unit.

Statement-wise Verification

• Statement 1 - Correct.
  Poynting vector represents power flow per unit area in electromagnetic field.
  The Poynting vector gives electromagnetic power-flow density and points in the direction of energy transport for a propagating wave.
• Statement 2 - Correct.
  It is given by the cross product of electric and magnetic field vectors.
  It is the cross product of electric and magnetic fields.
• Statement 3 - Correct.
  Direction of Poynting vector indicates direction of energy propagation.
  The Poynting vector gives electromagnetic power-flow density and points in the direction of energy transport for a propagating wave.
• Statement 4 - Incorrect.
  It has units of volts per meter.
  The correct principle is: S=E×H [W/m²].

Core Concept

The Poynting vector gives electromagnetic power-flow density and points in the direction of energy transport for a propagating wave. It is the cross product of electric and magnetic fields. Its SI unit is watt per square metre, not volt per metre.

Formula / Key Relationship

S=E×H [W/m²].

Why the Other Options Are Wrong

Option A is incorrect because it omits correct statement(s) 1. Option B is incorrect because it includes incorrect statement(s) 4 and omits correct statement(s) 2, 3. Option D is incorrect because it includes incorrect statement(s) 4.

Exam Shortcut / Approach

Cross E with H to get energy-flow direction.

Common Mistake

V/m is electric-field unit, not Poynting-vector unit.

Quick Revision

Electromagnetic Power Density is linked with Poynting Vector, Power Flow and Electromagnetic Fields. Cross E with H to get energy-flow direction.