Electro Magnetic Field Quiz

What is the property of a magnetic field that causes a force on a moving charge?

• electric force

• magnetic force

• gravitational force

• nuclear force

Answer explanation

The property of a magnetic field that causes a force on a moving charge is called magnetic force. It is the correct choice because a magnetic field exerts a force on a charged particle only when it is in motion.

What is the SI unit of magnetic field strength?

• joule

• tesla

• ampere

• watt

Answer explanation

The SI unit of magnetic field strength is the tesla. It is named after the Serbian-American inventor Nikola Tesla.

What is the direction of the magnetic field lines around a straight current-carrying conductor?

• Circular

• Spiral

• Straight

• Random

Answer explanation

The magnetic field lines around a straight current-carrying conductor are circular.

What happens to the strength of a magnetic field when the distance from the magnet increases?

• Becomes unpredictable

• Decreases

• Increases

• Remains the same

Answer explanation

The strength of a magnetic field decreases as the distance from the magnet increases. This is because the magnetic field spreads out and becomes weaker as it moves away from the source.

What is the formula to calculate the electric field intensity?

• E = mc^2

• E = F / q

• E = 1/2mv^2

• E = kq/r^2

Answer explanation

The formula to calculate the electric field intensity is E = F / q. This equation relates the electric field intensity (E) to the force (F) experienced by a charged particle and the charge (q) of the particle. It highlights the correct choice.

What is the SI unit of electric field strength?

• V/m

• A/m

• J/C

• C/kg

Answer explanation

The SI unit of electric field strength is V/m, which stands for volts per meter. It represents the amount of electric force exerted on a charged particle per unit of distance.

What is the direction of the electric field lines between two opposite charges?

• From left to right

• From negative to positive

• From positive to negative

• In a circular pattern

Answer explanation

The electric field lines between two opposite charges always go from positive to negative.

What is the relationship between the frequency and wavelength of an electromagnetic wave?

• Constant

• Unrelated

• Inverse

• Direct

Answer explanation

The frequency and wavelength of an electromagnetic wave are inversely related. As the frequency increases, the wavelength decreases, and vice versa. This relationship is known as inverse.

What are the three components of an electromagnetic wave?

• Frequency, wavelength, and amplitude

• Speed, acceleration, and force

• Electric field, magnetic field, and direction of propagation

• Voltage, current, and resistance

Answer explanation

An electromagnetic wave consists of an electric field, a magnetic field, and a direction of propagation. These three components work together to create the wave phenomenon.

What is the speed of light in a vacuum?

• 299,792,458 meters per second

• 500,000,000 meters per second

• 100,000,000 meters per second

• 1,000,000,000 meters per second

Answer explanation

The speed of light in a vacuum is 299,792,458 meters per second, which is the correct choice.