My Notes
The electrostatic field due to a charged conductor just outside the conductor is:
| 1. | zero and parallel to the surface at every point inside the conductor. |
| 2. | zero and is normal to the surface at every point inside the conductor. |
| 3. | parallel to the surface at every point and zero inside the conductor. |
| 4. | normal to the surface at every point and zero inside the conductor. |
In the absence of other conductors, the surface charge density
(1) Is proportional to the charge on the conductor and its surface area
(2) Inversely proportional to the charge and directly proportional to the surface area
(3) Directly proportional to the charge and inversely proportional to the surface area
(4) Inversely proportional to the charge and the surface area
Two equally charged, identical metal spheres A and B repel each other with a force 'F'. The spheres are kept fixed with a distance 'r' between them. A third identical, but uncharged sphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is
(1) F
(2) 3F/4
(3) F/2
(4) F/4
The figure shows the electric lines of force emerging from a charged body. If the electric fields at A and B are EA and EB respectively and if the distance between A and B is r, then:
1. \(E_{A}~>~E _{B}\)
2. \(E_{A}~<~E _{B}\)
3. \(E_{A}~=~\frac{E_{B}}{r^{}}\)
4. \(E_{A}~=~\frac{E_{B}}{r^{2}}\)
\(ABC\) 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. | \(\dfrac{1}{4\pi\epsilon _0}\dfrac{3q}{r^{2}}\) |
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