If primary winding of a transformer were connected to a battery , the current in it will :

Options

A. Increase
B. Remain constant
C. Decrease
D. First (1) then (3)

Answer

To solve the question, "If the primary winding of a transformer were connected to a battery, the current in it will:", we can break down the explanation into clear steps.

### Step-by-Step Solution:

1. **Understanding the Transformer Setup**:
- A transformer consists of two windings: the primary and the secondary. The primary winding is connected to an external source, in this case, a battery.

2. **Applying Voltage from the Battery**:
- When the primary winding is connected to a battery, a constant voltage (emf) is applied across it. Let's denote this voltage as \( V_p \).

3. **Current Calculation**:
- The current flowing through the primary winding can be calculated using Ohm's law. If we denote the resistance of the primary winding as \( R_p \), the current \( I_p \) can be expressed as:
\[ I_p = \frac{V_p}{R_p} \]
- Since \( V_p \) is constant (as it is provided by the battery), the current \( I_p \) will also remain constant as long as the resistance \( R_p \) does not change.

4. **Induced Current and Magnetic Flux**:
- In a transformer, the operation relies on changing magnetic flux to induce current in the secondary winding. However, since the current in the primary winding is constant (due to the constant voltage from the battery), the magnetic flux produced by this current will also remain constant.

5. **Conclusion on Induced Current**:
- Since the magnetic flux does not change (\( \frac{d\Phi}{dt} = 0 \)), there will be no induced emf or current in the secondary winding. Thus, the only current present is the primary current \( I_p \), which remains constant.

6. **Final Answer**:
- Therefore, the current in the primary winding will remain constant.