Physics
Grade-10
Easy
Question
Read the following statements and choose the correct option:
Assertion:
If a proton passes through a region of space without being deflected, the only possibility is that there is no magnetic field. Reason: Force is directly proportional to the magnetic field applied.
- Assertion is false, but the reason is true.
- Both assertion and reason are true, and the reason is the correct explanation of the assertion.
- Assertion is true, but the reason is false.
- Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
Hint:
Assertion is false, but the reason is true.
The correct answer is: Assertion is false, but the reason is true.
If the electron is not deflected in passing through a certain space,it is not necessary that there is no magnetic field as the force will be zero when the direction of motion is along the direction of the field.(along the field with zero deflection).
The magnetic force is proportional to q and to the magnitude of the vector cross product v × B.
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