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प्रश्न
Two metallic spheres A and B kept on insulating stands are in contact with each other. A positively charged rod P is brought near the sphere A as shown in the figure. The two spheres are separated from each other, and the rod P is removed. What will be the nature of charges on spheres A and B?
उत्तर १
On sphere A there will be negative charge & one sphere B there will be positive charge
उत्तर २
When we bring a positively charged rod near the sphere A, The free electrons in the spheres are attracted to the rod. This leaves an excess of positive charge on the farther surface of sphere B. Now after separating the spheres and removing the rod, the charges on spheres rearrange themselves and get uniformly distributed over them, as shown in Figure given below.
संबंधित प्रश्न
The relationship between the potential difference and the current in a conductor is stated in the form of a law.
1) Name the law.
2) What does the slope of V-I graph for a conductor represent?
3) Name the material used for making the connecting wire.
Keeping the p.d. constant, the resistance of a circuit is halved. The current will become:
(a) one-fourth
(b) four time
(c) half
(d) double
- Draw a V-I graph for a conductor obeying Ohm’s law.
- What does the slope of V–I graph for a conductor represent?
A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance?
A wire of resistance 9 ohm having length 30 cm is tripled on itself. What is its new resistance?
- Name and state the law which relates the potential difference and current in a conductor.
- What is the necessary condition for a conductor to obey the law named above in part (a) ?
What is non-ohmic resistor?
SI unit of resistance is:
An electronics hobbyist is building a radio which requires 150 Ω in her circuit, but she has only 220 Ω, 79 Ω, and 92 Ω resistors available. How can she connect the available resistors to get the desired value of resistance?
