FreeNotes
To arrange five resistances in a way that the total resistance is smaller than any given individual resistance, you should arrange them in parallel. Here’s how: Parallel connection: When resistors are connected in parallel, the total or equivalent resistance decreases. The formula for the total resistance Req of resistors connected in parallel is given by: … Read more
A bird sitting on a single wire is not electrocuted because both its feet are at the same potential, meaning no potential difference exists between them. Without a potential difference, current does not flow through the bird’s body. However, when the bird touches another wire (of a different potential), a potential difference is created between … Read more
Open switch: Infinite resistance. No current can flow. Closed switch: Zero resistance (ideally). It acts as a conductor, allowing current to flow freely. In an open switch, there is a physical gap, preventing charge flow. In a closed switch, the gap is bridged, allowing current to pass with negligible resistance. Related Questions: Can current flow … Read more
If aluminum and copper wires of the same length have the same resistance, the aluminum wire must have a larger diameter than the copper wire. This is because the resistance of a wire is inversely proportional to its cross-sectional area, and since aluminum has a lower electrical conductivity than copper, it needs a larger cross-sectional … Read more
No, current cannot flow in a circuit without a potential difference. According to Ohm’s Law: V = IR A potential difference (voltage) is necessary to push free electrons through a conductor. It provides the energy needed for electrons to move from the negative terminal to the positive terminal of a circuit. Without it, the electrons … Read more
No, current cannot flow in a circuit without a potential difference. According to Ohm’s Law: V = IR A potential difference (voltage) is necessary to push free electrons through a conductor. It provides the energy needed for electrons to move from the negative terminal to the positive terminal of a circuit. Without it, the electrons … Read more
Construction of a Parallel Plate Capacitor: A parallel plate capacitor consists of two flat, conducting plates that are placed parallel to each other and separated by a small distance. Here’s the construction in more detail: Plates: The two plates are made of conductive materials such as metal, and they are usually identical in shape and … Read more
Electrostatic induction is the process of charging a conductor without direct contact. Example: If a positively charged rod is brought near a neutral metal sphere, negative charges in the sphere move toward the rod, and positive charges move away. If the sphere is then grounded, positive charges escape, leaving the sphere negatively charged. When the … Read more
Coulomb’s Law describes the electrostatic force between two point charges. It states that the force between two charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them. This force is attractive if the charges are of opposite sign and repulsive if … Read more
The capacitance of a parallel plate capacitor is given by the formula: C=ε0A/d Where: C is the capacitance. ε0 is the permittivity of free space (a constant). A is the area of the plates. d is the distance between the plates. From this formula, you can see that the capacitance is inversely proportional to the distance between the plates … Read more