Assertion : An electric field is preferred in comparison to magnetic field for detecting the electron beam in a television picture tube.
Reason : Electric field require low voltage.

Explanation

To solve the given question, we need to analyze both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "An electric field is preferred in comparison to a magnetic field for detecting the electron beam in a television picture tube."

### Step 2: Analyze the Reason
The reason given is that "Electric field requires low voltage."

### Step 3: Evaluate the Assertion
In a television picture tube, the electron beam is controlled and directed using electric and magnetic fields. While both fields can be used, magnetic fields are generally preferred because they can control the electron beam without requiring high voltages.

### Step 4: Evaluate the Reason
The reason states that electric fields require low voltage. However, in practice, to create a strong electric field, a high voltage is often necessary. Therefore, this statement is misleading.

### Step 5: Conclusion
Since the assertion is incorrect (magnetic fields are preferred over electric fields in this context) and the reason is also incorrect (electric fields typically require high voltage to be effective), we conclude that both parts of the statement are false.

### Final Answer
Both the assertion and the reason are incorrect.

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