Explanation

Ferromagnetic materials (such as iron, cobalt, and nickel) have a strong attraction to magnetic fields and can retain their magnetism even after the external magnetic field is removed.

This property makes them ideal for making permanent magnets.

• Diamagnetic materials are repelled by magnetic fields and cannot retain magnetism.

• Paramagnetic materials are weakly attracted to magnetic fields but do not retain magnetism after the external field is removed.

Explanation

Explanation

Using Wien's displacement law:

λ_peak ∝ 1/T

Given: Initial temperature (T1) = 6000 K, Initial peak wavelength (λ1) = 4800 Å

Final temperature (T2) = 3000 K

λ2 / λ1 = T1 / T2

λ2 = λ1 * T1 / T2

= 4800 Å * 6000 K / 3000 K

= 9600 Å

Explanation

Lenz's law is consistent with the law of conservation of energy because it states that the induced current will always oppose the change that produced it.

Explanation

The force $F$ acting on a charged particle moving in a magnetic field is given by the Lorentz force equation, which can be expressed as:

$$F = q(mathbf{v} times mathbf{B})$$

Where:

• $\mathrm{<font\; color="\#0000ff"><b>F\; is\; the\; force\; acting\; on\; the\; particle,</b></font>}$
• $q$ is the charge of the particle,
• $mathbf{v}$ is the velocity vector of the particle,
• $\mathbf{B}$ is the magnetic flux density (magnetic field strength) vector.

The cross product $\mathbf{v}\times \mathbf{B}$ indicates that the direction of the force is perpendicular to both the velocity and the magnetic field vectors. Thus, the correct expression for the force is $F=qv\times B$.

Explanation

Accuracy is defined as the measure of how close an instrument's readings are to the true value.

It indicating how error-free it is.

Explanation

• Wind produces kinetic energy, which is the energy of motion.
• This kinetic energy is used to rotate the blades of a fan or turbine in a wind energy system.
• It converting the wind's kinetic energy into mechanical energy, and ultimately into electrical energy.

Explanation

• Cone cells are responsible for vision in bright light and color vision.
• There are three types of cone cells, each sensitive to different parts of the visual spectrum, which allows us to see a range of colors.

Explanation

• Conduction is the transfer of internal energy (heat) through direct contact between particles or molecules.
• Including collisions and movements of electrons within a substance.
• This process occurs in solids.

Explanation

• Meteoroids are small rocky particles that float in outer space.
• They can range in size from a grain of sand to a boulder.
• When a meteoroid enters Earth's atmosphere, it becomes a meteor (shooting star).
• It can potentially land on Earth as a meteorite.