All are of solder- less construction. All varia- tions are minus. Since fuse links having silver element construction are not sub- ject to damage by aging or transient overcurrents, it is unnecessary to replace unblown fuse links of such construction in single-phase or three-phase installations when one or more fuse links have blown. However, it is advisable to replace unblown silver-tin element fuse links under the same conditions, since—while not subject to aging— they may be damaged by transient overcurrents.
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State the condition under which the terminal potential difference across a battery and its emf are equal. When battery is in open circuit i. State the condition for maximum current to be drawn from a cell. An oil drop of mass m carrying charge Q is to be held stationary in the gravitational eld of the earth. What is the magnitude and direction of the electrostatic eld required for his purpose?
Draw E and V versus r on the same graph for a point charge. Find position around dipole at which electric potential due to dipole is zero but has non zero electric eld intensity. Derive an expression for the work done in rotating an electric dipole from its equilibrium position to an angle with the uniform electrostatic eld.
A electrostatic eld line can not be discontinuous. Calculate the electric eld intensity at a point 5 cm from it. Draw a graph to show variation of electric eld intensity with distance from the conductor. What is the ratio of electric eld intensity at a point on the equatorial line to the eld at a point on axial line when the points are at the same distance from the centre of the dipole? Show that the electric eld intensity at a point can be given as negative of potential gradient. A charged metallic sphere A having charge qA is brought in contact with an uncharged metallic sphere of same radius and then separated by a distance d.
What is the electrostatic force between them. An electron and a proton travel through equal distances in the same uniform electric eld E. Compare their time of travel. Neglect gravity Calculate the electric intensity at point P 1, 0, 2. Justify why two equipotential surfaces cannot intersect. Find equivalent capacitance between A and B in the combination given below : each capacitor is of 2 F.
What should be the charge on a sphere of radius 4 cm, so that when it is brought in contact with another sphere of radius 2 cm carrying charge of 10 C, there is no transfer of charge from one sphere to other? For an isolated parallel plate capacitor of capacitance C and potential difference V, what will be change in i charge on the plates ii potential difference across the plates iii electric eld between the plates iv energy stored in the capacitor, when the distance between the plates is increased?
Does the maximum charge given to a metallic sphere of radius R depend on whether it is hollow or solid? Give reason for your answer. No charge resides on the surface of conductor. Two charges Q1 and Q2 are separated by distance r. Under what conditions will the electric eld be zero on the line joining them i between the charges ii outside the charge?
Obtain an expression for the electric eld due to electric dipole at any point on the equatorial line. The electric eld component in the gure are Calculate the electric ux through, 1, 2, 3 the square surfaces of side 5 m. What is electric eld between the plates with the separation of 2 cm and i with air ii dielectric medium of dielectric constant K. Electric potential of each plate is marked in the following gure.
If the capacitor is charged to 5. The gure shows the Q charge versus V potential graph for a combination of two capacitors. A represents parallel combination How much work is done in moving a test charge from point P 7, 0, 0 to Q 3, 0, 0?
What is the work done by external agent to take 2 units S. How does the Potential energy of i mutual interaction ii net electrostatic P. With the help of an example, show that Farad is a very large unit of capacitance. What is meant by dielectric polarisation? Why does the electric eld inside a dielectric decreases when it in placed in an external eld? In charging a capacitor of capacitance C by a source of emf V, energy supplied by the sources QV and the energy stored in the capacitor is QV.
Justify the difference. If the dipole is released does it have a Unit I - II 21 only rotational motion b only translatory motion c both translatory and rotatory motion? The net charge of a system is zero. Will the electric eld intensity due to this system also be zero.
12 CBSE PHYSICS.pdf
State the condition under which the terminal potential difference across a battery and its emf are equal. When battery is in open circuit i. State the condition for maximum current to be drawn from a cell. An oil drop of mass m carrying charge Q is to be held stationary in the gravitational eld of the earth. What is the magnitude and direction of the electrostatic eld required for his purpose? Draw E and V versus r on the same graph for a point charge.
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