الیکٹرک فیلڈ کی شدت کی اکائی _____ ہے؟
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A. None of these
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B. Joule/coulomb
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C. Newton/coulomb
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D. Newton
Explanation
Electric field intensity (E) is defined as force per unit charge: E = F/q.
So its unit is Newton/Coulomb (N/C).
جب کوئی چارج شدہ ذرہ یکساں مقناطیسی فیلڈ میں داخل ہوتا ہے تو ، اس کی متحرک توانائی _____؟
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A. None of these
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B. Decreases
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C. Increases
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D. Remains constant
Explanation
A magnetic field exerts a force perpendicular to the motion of the charged particle, changing its direction but not its speed.
Since no work is done by the magnetic field, the kinetic energy stays constant.
ایک پوائنٹ چارج سے لامحدود فاصلے پر بجلی کی شدت ______ ہوگی؟
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A. Zero
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B. None of these
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C. Positive
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D. Infinite
Explanation
- Electric intensity (E) due to a point charge is given by E = kQ/r², where r is the distance from the charge.
- As r → ∞, E → 0, meaning the electric field strength becomes zero at an infinite distance.
کھوکھلی کروی کنڈکٹر کے اندر فیلڈ ______ ہے؟
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A. Constantly zero
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B. Function of distance from the center
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C. Constant but not necessarily zero
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D. None of these
Explanation
- According to Gauss's Law, the electric field inside a hollow spherical conductor is zero because any excess charge resides on the outer surface.
- This happens because the conducting material redistributes charge to cancel out internal electric fields.
ایک ڈوپول میں ، گاؤس تھیوریم کی قیمت _____ ہوگی؟
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A. 2
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B. 0
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C. 1
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D. None of these
Explanation
- Gauss's Theorem (Gauss's Law): States that the total electric flux through a closed surface is proportional to the enclosed charge.
- Dipole Net Charge: A dipole consists of equal and opposite charges (+q and -q).
- So the net charge enclosed by any Gaussian surface around it is zero.
- This making the Gauss theorem value 0.
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A. Electric potential
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B. Electric intensity
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C. Electric power
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D. Electric field gradient
Explanation
The formula 𝑉 = 𝑊/ 𝑞0 represents electric potential, where 𝑉 is the potential, 𝑊 is the work done, and 𝑞0 is the test charge.
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A. F = q. dv/dx
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B. F = −q. dv/dx + qE
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C. F = −q. dv/dx
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D. F = dV/dx
Explanation
A proton is moving in an electric field described by the potential V= x+6. What is the force experienced by the proton F = −q. dv/dx.
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A. Always negative
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B. Can be positive or negative
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C. Always positive
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D. Always zero
Explanation
In the relation E = F/q , the charge q is always positive.
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