Q. No.Two charges placed in the air at a distance of \(1\) m exert force \(F\) on each other. If these charges are placed inside mica at the same distance, then the new net force between charges is:
| 1. | \(>F\) |
| 2. | \(<F\) |
| 3. | \(=F\) |
| 4. | depends on the area of the slab |
Subtopic: Electric Field |
69%
From NCERT
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The electric field, at the centre of a square with charges placed at its four vertices as shown in the figure, is: \(\Big(k=\dfrac{1}{4\pi\varepsilon_0}\Big)~\)
| 1. | zero | 2. | \(4\dfrac{kq}{a^2}\) |
| 3. | \(2\dfrac{kq}{a^2}\) | 4. | \(2\sqrt2\dfrac{kq}{a^2}\) |
Subtopic: Electric Field |
71%
From NCERT
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A proton and an electron are placed in an electric field. Then we can say:
| 1. | the electric force acting on them are equal. |
| 2. | the magnitude of the forces is equal. |
| 3. | their acceleration is equal. |
| 4. | the magnitude of their acceleration is equal. |
Subtopic: Electric Field |
80%
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A spherical conductor of radius \(12~\text{cm}\) has a charge of \(1.6\times10^{-7}~\text{C}\) distributed uniformly on its surface. The electric field just outside the sphere is:
| 1. | \(\text{zero}\) | 2. | \(10^5~ \text{NC}^{-1} \) |
| 3. | \(10^{-5}~ \text{NC}^{-1} \) | 4. | \(10^{6 }~ \text{NC}^{-1} \) |
Subtopic: Electric Field |
65%
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Two point charges \(q_A = 3~\mu\text{C}\) and \(q_B = -3~\mu\text{C}\) are located \(20\) cm apart in a vacuum. The electric field at the midpoint \(O\) of the line \(AB\) joining the two charges is:
1. \(4.5\times10^{6}~\text{N/C along}~OA\)
2. \(5.4\times10^{6}~\text{N/C along}~OA\)
3. \(4.5\times10^{6}~\text{N/C along}~OB\)
4. \(5.4\times10^{6}~\text{N/C along}~OB\)
1. \(4.5\times10^{6}~\text{N/C along}~OA\)
2. \(5.4\times10^{6}~\text{N/C along}~OA\)
3. \(4.5\times10^{6}~\text{N/C along}~OB\)
4. \(5.4\times10^{6}~\text{N/C along}~OB\)
Subtopic: Electric Field |
59%
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A particle of mass \(m\) and charge \(q\) is placed in a uniform electric field \(E\) at \(t=0~\text s.\) The kinetic energy of the particle after time \(t\) is:
1. \(\dfrac{Eqm}{t}\)
2. \(\dfrac{E^2q^2t^2}{2m}\)
3. \(\dfrac{2E^2t^2}{qm}\)
4. \(\dfrac{Eq^2m}{2t^2}\)
1. \(\dfrac{Eqm}{t}\)
2. \(\dfrac{E^2q^2t^2}{2m}\)
3. \(\dfrac{2E^2t^2}{qm}\)
4. \(\dfrac{Eq^2m}{2t^2}\)
Subtopic: Electric Field |
82%
From NCERT
NEET - 2024
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Given below are two statements:
| Assertion (A): | Point charges \(q_{1}\) and \(q_{2}\) produce electric field of magnitude \(E_{1}\) and \(E_{2}\) at a point and potential \(V_{1}\) and \(V_{2}\) at the same point. The electric field due to both the charges at that point must be \(E_{1}+E_{2}.\) |
| Reason (R): | The electric potential at that point due to both the charges must be \(V_{1}+V_{2}.\) |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Electric Field |
60%
From NCERT
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A point charge is brought in an electric field. The electric field at a nearby point,
| (a) | will increase if the charge is positive |
| (b) | will decrease if the charge is negative |
| (c) | may increase if the charge is positive |
| (d) | may decrease if the charge is negative |
| 1. | (a) only | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
Subtopic: Electric Field |
68%
From NCERT
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Twelve point charges each of charge \(q~\text C\) are placed at the circumference of a circle of radius \(r~\text m\) with equal angular spacing. If one of the charges is removed, the net electric field (in \(\text{N/C}\)) at the centre of the circle is:
(\(\varepsilon_0 \)-permittivity of free space)
| 1. | \(\frac{13q}{4\pi \varepsilon_0r^2}\) | 2. | zero |
| 3. | \(\frac{q}{4\pi \varepsilon_0r^2}\) | 4. | \(\frac{12q}{4\pi \varepsilon_0r^2}\) |
Subtopic: Electric Field |
64%
From NCERT
NEET - 2022
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\(ABC\) is an equilateral triangle. Charges \(+q\) are placed at each corner. The electric intensity at \(O\) will be:
| 1. | \(\dfrac{1}{4\pi\epsilon _0}\dfrac{q}{r^{2}}\) | 2. | \(\dfrac{1}{4\pi\epsilon _0}\dfrac{q}{r^{}}\) |
| 3. | zero | 4. | \(\dfrac{1}{4\pi\epsilon _0}\dfrac{3q}{r^{2}}\) |
Subtopic: Electric Field |
87%
From NCERT
PMT - 1985
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