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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?
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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
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.
Name the unit of electrical resistance and give its symbol.
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
Rewrite the following statement by selecting the correct option.
The S.I. unit of resistance is __________.
What is non-ohmic resistor?
SI unit of resistance is:
Ohm’s law states the relationship between power and voltage.
What is non ohmic device?
The voltage - current readings of a certain material are shown in the table given below:
| Voltage (V) | 10 V | 20 V | 30 V |
| Current (I) | 2 A | 3 A | 4 A |
Study the table.
- State whether the conductor used is ohmic or non-ohmic.
- Justify your answer.
- State Ohm's law.
