Explanation

A wattmeter is an electrical instrument which is used to measure the electric power (in watts) of any electrical circuit.

**Additional Information**

Voltmeter – is used to measure the electric potential difference between two points,

Wavemeter – is used to measure the wavelength of a radio wave,

Viscometer – is used to measure the viscosity of the liquid.

Explanation

This formula is the Lorentz force law

And describes the force experienced by a current-carrying conductor in a magnetic field.

F=BILsin(θ)

F is the force acting on the conductor (in Newtons, N).

B is the magnetic field strength (in Tesla, T).

I is the current flowing through the conductor (in Amperes, A).

L is the length of the conductor that is perpendicular to the magnetic field (in meters, m).

θ is the angle between the current's direction and the magnetic field's direction.

Explanation

The correct equation for the position of the bright fringes in Young's double-slit experiment is:

𝑦 =𝑚𝜆𝐷/𝑑

Where

y is the position of the bright fringe on the screen.

m is the order of the bright fringe (0, 1, 2, ...).

λ is the wavelength of light.

D is the distance between the slits and the screen.

d is the distance between the two slits.

Explanation

The temperature within 10 km of the Earth's core is approximately 4000 Kelvin (K).

At such depths, the temperature is incredibly high due to the immense pressure and heat generated by the Earth's core.

Explanation

• Nuclear energy is a method of harnessing the energy released from the splitting of atomic nuclei (a process called nuclear fission) to generate electricity.
• The main purpose of nuclear energy is to provide a clean and reliable alternative source of energy, reducing dependence on fossil fuels and mitigating climate change.

Explanation

The transformer works only on an AC supply

because A transformer needs an alternating current that will create a changing magnetic field

Note:

The transformer does not work on DC.

Direct current doesn't have a variable magnetic field

Explanation

To determine the height of the fluid above the orifice, we use Torricelli's law, which states:

v= √2gh

where:

v is the speed of efflux (9.8 m/s)

𝑔 is the acceleration due to gravity (9.8 m/s²)

h is the height of the fluid above the orifice

We need to solve for h: 9.8=  2×9.8×h

Square both sides to eliminate the square root:

9.8 ^2 = √2×9.8×h

96.04=19.6h

Divide both sides by 19.6 to isolate ℎ:

ℎ = 96.04/ 19.6

h=4.9m

Explanation

Aluminium is capable of superconductivity, with a superconducting critical temperature of 1.2 kelvin

And a critical magnetic field of about 100 gauss (10 milliteslas)

It is paramagnetic and thus essentially unaffected by static magnetic fields

Explanation

• The Equator is an imaginary line that runs east-west around the middle of the Earth, dividing it into the Northern Hemisphere and the Southern Hemisphere.
• It is located at 0° latitude (0° N or 0° S).

Explanation

• A telescope is an instrument that gathers light from distant sources.
• Such as stars, planets, galaxies, and other celestial objects.
• It allowing us to study and observe them in greater detail.