Explanation

The negative gradient of electric potential is called Electric field intensity. 

Gradient:

In general, a gradient represents the rate of change of a function for a given variable.

In the context of electric fields, the gradient of electric potential indicates how quickly the potential changes as you move in a particular direction. 

Negative gradient:

The "negative" part signifies that the electric field points in the direction of decreasing potential. 

Explanation

Explanation

The number of loops in stationary waves depends on the wavelength of the waves. 

A longer wavelength means fewer loops fit within a given length, and vice versa, so the number of loops is directly related to the wavelength. 

Explanation

 An autotrophic organism is an organism that produces its food, so the correct answer is Algae. 

Algae use photosynthesis to create their own food from sunlight, water, and carbon dioxide, making them a prime example of an autotroph. 

Explanation

• One parallel to the field (causes straight motion)
• One perpendicular to the field (causes circular motion)

Explanation

A cell counter is a device specifically designed to count the number of cells in a suspension.

This is crucial in cell culture experiments, as researchers need to know the cell concentration before seeding or performing other procedures. 

Explanation

Acidified potassium permanganate (KMnO4), acidified potassium dichromate (K2Cr2O7), and silver nitrate (AgNO3 (in the form of Tollens' reagent) can all oxidize aldehydes to carboxylic acids. 

Acidified KMnO4:

• A strong oxidizing agent that readily converts aldehydes to carboxylic acids.
• It changes color from purple to colorless during the reaction. 

Acidified K2Cr2O7:

• Also a strong oxidizing agent that can oxidize aldehydes to carboxylic acids.
• It changes color from orange to green during the reaction. 

AgNO3 (in Tollens' reagent):

• A milder oxidizing agent compared to the previous two, but still capable of oxidizing aldehydes.
• It gives a characteristic silver mirror precipitate when reacting with an aldehyde. 

Explanation

Weight depends on the gravitational force, which decreases with altitude.

As the person moves away from the Earth's surface, gravity slightly weakens, so their weight becomes less than 600 N.

Explanation

The right ventricle is responsible for pumping deoxygenated blood to the lungs.

While the right atrium receives blood from the vena cava, it only needs to passively push that blood into the right ventricle.

The right ventricle, however, needs to generate significant force to propel the blood through the pulmonary artery to the lungs.

This requires a thicker, more muscular wall. 

Explanation

The electrostatic force between two charges is given by Coulomb’s Law:

F = k * q₁ * q₂ / R²

If a total charge Q is divided into two parts: q and Q−q, the force becomes:

F = k * q * (Q − q) / R²

To maximize F, differentiate F with respect to q and set dF/dq = 0:

dF/dq = k/R² * [Q − 2q] = 0  

⇒ Q − 2q = 0  

⇒ q = Q/2