Advertisements
Advertisements
Question
Distinguish between Conductors and Insulators.
Solution
Conductors and Insulators
| Conductors | Insulators | ||
| 1 | A substance which has very low electrical resistance is called a conductor. | 1 | A substance which has infinitely high electrical resistance is called an insulator. |
| 2 | Conductors contain charge carriers which can be easily accelerated by a potential difference. | 2 | Insulators do not contain charge carriers which can be easily accelerated by a potential difference. |
| 3 | Silver and copper are conductors. | 3 | Wood and glass are insulators. |
APPEARS IN
RELATED QUESTIONS
Draw a labelled diagram of Van de Graaff generator. State its working principle to show how by introducing a small charged sphere into a larger sphere, a large amount of charge can be transferred to the outer sphere. State the use of this machine and also point out its limitations.
In the figure shown, an ammeter A and a resistor of 4 Ω are connected to the terminals of the source. The emf of the source is 12 V having an internal resistance of 2 Ω. Calculate the voltmeter and ammeter readings.
The figure shows a plot of three curves a, b, c, showing the variation of photocurrent vs collector plate potential for three different intensities I1, I2and I3 having frequencies v1, v2 and v3 respectively incident of a photosensitive surface.
Point out the two curves for which the incident radiations have same frequency but different intensities.
Both the capacitors shown in figure are made of square plates of edge a. The separations between the plates of the capacitors are d1 and d2 as shown in the figure. A potential difference V is applied between the points a and b. An electron is projected between the plates of the upper capacitor along the central line. With what minimum speed should the electron be projected so that it does not collide with any plate? Consider only the electric forces.
Find the potential difference `V_a - V_b` between the points a and b shown in each part of the figure.
The capacitance between the adjacent plates shown in the figure is 50 nF. A charge of 1.0µC is placed on the middle plate. If 1.0 µC is placed on the upper plate instead of the middle, what will be the potential difference between (a) the upper and the middle plates and (b) the middle and the lower plates?
A capacitor having a capacitance of 100 µF is charged to a potential difference of 50 V. (a) What is the magnitude of the charge on each plate? (b) The charging battery is disconnected and a dielectric of dielectric constant 2⋅5 is inserted. Calculate the new potential difference between the plates. (c) What charge would have produced this potential difference in absence of the dielectric slab. (d) Find the charge induced at a surface of the dielectric slab.
Answer the following question:
Find the expression for the resistivity of a material.
In circuits, a difference in potential from one point to another is often called ______.
Two metal pieces having a potential difference of 800 V are 0.02 m apart horizontally. A particle of mass 1.96 × 10–15 kg is suspended in equilibrium between the plates. If e is the elementary charge, then charge on the particle is ______.
Assertion: Electric potential and electric potential energy are different quantities.
Reason: For a system of positive test charge and point charge electric potential energy = electric potential.
- It depends only on the initial and final position.
- It is the work done per unit positive charge in moving from one point to other.
- It is more for a positive charge of two units as compared to a positive charge of one unit.
A and B are two points in an electric field. If the work done in carrying 4.0C of electric charge from A to B is 16.0 J, the potential difference between A and B is:
An α-particle and a proton are accelerate at same potential difference from rest. What will be the ratio of their final velocity?
If potential difference between the two ends of a metallic wire is doubled, drift speed of free electrons in the wire ______.
