Q. No.1. zero
2. \(\sqrt2\frac{kq}{a}\)
3. \(2\frac{kq}{a}\)
4. \(4\frac{kq}{a}\)
Two tiny spheres carrying charges of \(1.5\) µC and \(2.5\) µC are located \(30\) cm apart. What is the potential at a point \(10\) cm from the midpoint in a plane normal to the line and passing through the mid-point?
| 1. | \(1.5\times 10^{5}\) V | 2. | \(1.0\times 10^{5}\) V |
| 3. | \(2.4\times 10^{5}\) V | 4. | \(2.0\times 10^{5}\) V |
1. \(10\) V
2. \(5 \sqrt 2\) V
3. \(10 \sqrt 2\) V
4. \(10 (\sqrt {2} -1)\) V
1. zero
2. \({kq \over 2R}\)
3. \({-kq \over 2R}\)
4. \({2kq \over R}\)
1. \(180^\circ\)
2. \(0^\circ\)
3. \(45^\circ\)
4. \(90^\circ\)
The diagrams below show regions of equipotential.
A positive charge is moved from \(\mathrm{A}\) to \(\mathrm{B}\) in each diagram. Choose the correct statement from the options given below:
| 1. | in all four cases, the work done is the same. |
| 2. | minimum work is required to move \(q\) in figure (a). |
| 3. | maximum work is required to move \(q\) in figure (b). |
| 4. | maximum work is required to move \(q\) in figure (c). |
Consider a uniform electric field in the \(z\text-\)direction. The potential is a constant:
| (a) | in all space. |
| (b) | for any \(x\) for a given \(z.\) |
| (c) | for any \(y\) for a given \(z.\) |
| (d) | on the \(x\text-y\) plane for a given \(z.\) |
Choose the correct option:
| 1. | (c), (d) | 2. | (a), (c) |
| 3. | (b), (c), (d) | 4. | (a), (b) |
In a region, the potential is represented by \(V=(x,y,z)=6x-8xy-8y+6yz,\) where \(V\) is in volts and \(x,y,z\) are in meters. The electric force experienced by a charge of \(2\) coulomb situated at a point \((1,1,1)\) is:
1. \(6\sqrt{5}~\text{N}\)
2. \(30~\text{N}\)
3. \(24~\text{N}\)
4. \(4\sqrt{35}~\text{N}\)
In a certain region of space with volume \(0.2\) m3, the electric potential is found to be \(5\) V throughout. The magnitude of electric field in this region is:
1. \(0.5\) N/C
2. \(1\) N/C
3. \(5\) N/C
4. zero
The electric field at the origin is along the positive \(x\text-\)axis. A small circle is drawn with the centre at the origin cutting the axes at points \(\mathrm A\), \(\mathrm B\), \(\mathrm C\) and \(\mathrm D\) having coordinates \((a,0),(0,a),(-a,0),(0,-a)\) respectively. Out of the points on the periphery of the circle, the potential is minimum at:
1. \(\mathrm A\)
2. \(\mathrm B\)
3. \(\mathrm C\)
4. \(\mathrm D\)
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