Ans: The eye perceives different colors through specialized photoreceptor cells called cones and rods. Cones are responsible for detecting color and detail in bright light conditions. They contain different types that are sensitive to specific wavelengths, allowing us to perceive…
Ans: Common eye problems include myopia (nearsightedness), hypermetropia (farsightedness), astigmatism, presbyopia, and cataracts. These issues can often be treated by using corrective lenses to adjust the focal point between the lens and the retina, or by addressing corneal irregularities through…
Ans: The human eye adjusts its focus to see objects at different distances through a process called accommodation. Accommodation refers to the eye’s ability to adjust its optical power in order to keep objects in focus as their distance changes.…
Ans. The human eye consists of several key components: Cornea: The eye is spherical and has a protective white layer. The front part of this layer is clear and called the cornea. Iris: Situated behind the cornea, the iris is…
Ans: The eye is a wonderful sensory organ that detects and processes light, enabling us to perceive the environment around us. The light enters the eye through the cornea which is the clear outermost layer. The light then passes through…
Ans: A loudspeaker works by combining electricity and magnetism. When an electric current flows through a coil of wire attached to a diaphragm (a thin, flexible material), it becomes an electromagnet. This coil is placed near a permanent magnet. As…
Ans: Magnetic fields play a crucial role in devices like transformers. Transformers use magnetic fields to transfer electrical energy between two coils of wire. When an alternating current (AC) flows through the primary coil, it creates a changing magnetic field.…
Ans: Here are the applications of electromagnets: Power generators, electric motors, and transformers Doorbells and buzzers Headphones and loudspeakers Relays and control valves Data storage devices such as hard drives, tape recorders, and VCRs Related Questions No posts found!
Ans: Direct Current (DC) Alternating Current (AC) The electric charge flows in only one direction, from the positive terminal to the negative terminal. It maintains a constant polarity. The direction of the electric charge reverses periodically. It constantly changes direction,…
Ans: Electric generator works on the principle of electromagnetic induction. An electric generator is a device which convert mechanical energy to electric energy. The concept of electromagnetic induction explains that altering the magnetic field near a conductor can produce an…
Ans: The direction of induced current in a coil follows Lenz’s Law, which states that it opposes changes in the magnetic field. If the magnetic field passing through the coil increases, the induced current flows to counteract that increase. Conversely,…
Ans: Faraday’s Laws of Electromagnetic Induction are composed of two principles. The first law explains how emf (electromotive force) is generated in a conductor, while the second law provides a way to measure the emf produced in the conductor. First…
Ans: A galvanometer is a device used to detect and measure electric current in a circuit. It operates based on the principle of electromagnetic induction, which means that when an electric current flows through a wire, it produces a magnetic…
Ans: An electric motor is a device that converts electrical energy into mechanical energy. Principle: In a basic electric motor, when an electric current is passed through a conductor placed normally in a magnetic field.The conductor is subjected to a…
Ans: Electromagnets are magnets whose magnetic field is generated by electricity. Unlike regular magnets that always have their magnetism, an electromagnet’s strength can be changed by controlling the amount of electric current passing through it. When you stop the electric…
