The question asks about the energy conversion process that occurs in a battery. A battery is a device designed to store energy and release it in a specific form. We need to identify the output energy form.
A) Electrical energy — A battery stores chemical energy and converts it into electrical energy when connected to a load. This electrical energy is what powers electronic devices.
The question asks to identify the atmospheric layer where free charged particles exist. This requires knowledge of the different layers of Earth's atmosphere and their characteristics, specifically their composition and electrical properties.
Correct Option: A) Ionosphere is the region in the upper atmosphere characterized by a high concentration of ions and free electrons, formed by the ionization of atmospheric gases by solar radiation.
The question asks to identify a safety device that operates based on the heating effect of electric current. We need to examine the function of each given option in relation to this principle.
B) Fuse — A fuse is specifically designed to melt and break a circuit when the current exceeds a safe limit, relying entirely on the heating effect of electric current to protect electrical appliances and wiring from damage due to overcurrent or short circuits.
This question tests the understanding of energy conversion in common electrical appliances, specifically a room heater. A room heater's primary function is to produce heat, which implies a conversion of electrical energy into heat energy.
A) Electric energy, heat energy — When current flows through the heating element of a room heater, the electrical energy is converted into heat energy due to the resistance of the element. This is the fundamental principle of how a room heater works.
The question asks about the standard symbols used to represent an electric cell in circuit diagrams. Specifically, it inquires about the identification of the positive and negative terminals based on the length of the lines in the symbol.
C) both (i) and (ii) — Both statements accurately describe the standard convention for representing the terminals of an electric cell in circuit diagrams. The longer line signifies the positive terminal, and the shorter line signifies the negative terminal.
This question tests the fundamental principles of electromagnetism, specifically how electric charges interact with electric and magnetic fields. We need to recall the force equations for a charge in an electric field and a magnetic field to determine the correct answer.
Correct Option: A) An electric charge will experience a force if an Electric Field is applied. This is because the force \(\vec{F}_e = q\vec{E}\) acts on the charge regardless of its state of motion. Even a stationary charge experiences a force in an electric field.