The SI unit of displacement current is

Options

A. Henry
B. Coulomb
C. Ampere
D. Faraday

Answer

To find the SI unit of displacement current, we can follow these steps:

### Step 1: Understand the concept of displacement current
Displacement current is a term introduced by James Clerk Maxwell to account for changing electric fields in situations where there is no actual flow of charge (like in a capacitor). It is crucial in the context of electromagnetic waves and Maxwell's equations.

### Step 2: Relate displacement current to electric current
Displacement current is defined in the context of Maxwell's equations and is given by the equation:
\[ I_d = \epsilon_0 \frac{d\Phi_E}{dt} \]
where \( I_d \) is the displacement current, \( \epsilon_0 \) is the permittivity of free space, and \( \Phi_E \) is the electric flux.

### Step 3: Identify the units involved
The unit of electric current (I) is the ampere (A). Since displacement current behaves like actual current in terms of its effects, its unit must also be the same.

### Step 4: Conclude the SI unit of displacement current
Since the displacement current is analogous to actual current, we conclude that the SI unit of displacement current is also the ampere (A).

### Final Answer:
The SI unit of displacement current is **ampere (A)**.

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