Explanation

The incorrect statement is "Magnetic field is strongest when the lines are farthest."

In fact, the magnetic field is strongest where the lines are closest together.

It indicating a higher density of magnetic field lines.

Explanation

The unit of magnetic flux density is Wb m⁻² (weber per square meter).

It is commonly referred to as a tesla (T), which quantifies the strength of the magnetic field.

Explanation

In an AC generator, the emf will be maximum when the factor sinωt is equal to 1.

This occurs when the angle is 90°.

This resulting in the peak value of the sinusoidal emf.

Explanation

Electric generators and transformers are based on the principles of Faraday's law.

This law explains electromagnetic induction, where a changing magnetic field induces an electric current.

Explanation

Gamma rays are the highest energy photons, with energies typically above 100,000 electronvolts (eV).

They are a type of electromagnetic radiation, like X-rays and visible light, but with much shorter wavelengths and higher frequencies.

Explanation

A hygrometer measures the amount of water vapor (humidity) in the air.

It is widely used in meteorology, agriculture, and HVAC systems.

Types of hygrometers include mechanical, electronic, and psychrometers.

Maintaining proper humidity is important for health, comfort, and industrial processes.

Explanation

A pinhole camera works without lenses.

It uses a small aperture (pinhole) to project an inverted image of the scene onto the opposite surface.

Explanation

Conical and cylindrical projections are types of map projections that use light from a source point.

In conical projections, the light source is at the center of the sphere, projecting onto a cone,

While cylindrical projections wrap the light around a cylinder.

Explanation

The separation of visible light into its different colours is known as dispersion.

When white light passes through a prism, it splits into 7 colors, forming a spectrum known as a rainbow:

1. Red
2. Orange
3. Yellow
4. Green
5. Blue
6. Indigo
7. Violet

Explanation

Hydrogen has an atomic weight of 1.00794u and accounts for 75% of the universe,

Thus making it the lightest and most abundant element in the universe.