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A. None of these
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B. 4:1
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C. 1:2
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D. 2:1
Explanation
- The kinetic energy gained by a charged particle in an electric field is given by KE = qV, where q is charge and V is the potential difference.
- Since kinetic energy is also KE = ½ mV², equating both expressions gives V = √(2qV/m).
- For particle A (q) and particle B (4q), their velocities will be VA = √(2qV/m) and VB = √(8qV/m).
- Taking the ratio: VA/VB = √(2qV/m) / √(8qV/m) = 1/2.
جب مقناطیسی میدان اور ایریا ویکٹر کھڑے ہیں تو مقناطیسی بہاؤ ______ ہوگا؟
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A. Minimum
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B. Zero
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C. Maximum
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D. None of these
Explanation
- Magnetic flux is zero when the magnetic field and area vector are perpendicular.
- Because the angle between them is 90°.
- This causing the cosine of the angle to be zero.
- Flux depends on the cosine of the angle between the magnetic field and the area vector.
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