AIIMS 2010 Physics Electric Fields and Their Applications Assertion Reason Question
Assertion: An electric field is preferred in comparison to magnetic field for detecting the electron beam in a television picture tube. Reason: Electric field requires low voltage.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Assertion is true but Reason is false.
Both Assertion and Reason are false.
Correct Answer
Detailed Explanation
The assertion states that an electric field is preferred over a magnetic field for detecting the electron beam in a television picture tube. This is indeed false because, in practice, magnetic fields are often utilized in CRTs (Cathode Ray Tubes) for steering and focusing the electron beam. The reason provided states that an electric field requires low voltage, which is also misleading. In fact, electric fields can operate at various voltage levels depending on the application. Therefore, both the assertion and the reason are false, leading to the correct answer being D.
In a CRT, magnetic fields are used to manipulate the electron beam due to their effectiveness in controlling the path of charged particles. The preference for magnetic fields is due to their ability to provide precise control without the issues of electric field breakdown at higher voltages. Hence, the correct answer is D, as both statements are incorrect.
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