Explanation

A capacitor is a device used to store electrical charge and electrical energy.

It consists of at least two electrical conductors separated by a distance.

It is widely used in electronic circuits for filtering, timing, and energy storage.

Explanation

The magnetic force acting on a charge at rest in a magnetic field is zero.

This is because the magnetic force formula, F = q(v × B), includes the velocity (v) of the charge,

And if the charge is at rest, its velocity is zero, making the entire force equal to zero. 

Explanation

1 kilowatt hour (kWh) = 1000 watts × 3600 seconds

1 kWh = 1,000 × 3,600 = 3,600,000 joules (J)

Explanation

Cyclotron frequency is given by:  

f = (qB) / (2πm)  

- Where q is charge, B is magnetic field, and m is mass.  

- If mass (m) is doubled, frequency becomes half.  

So, frequency is inversely proportional to mass.

Explanation

When the velocity of an object is doubled, its kinetic energy becomes four times its original value.

This is because the kinetic energy formula (KE = 1/2 * mv²) shows that kinetic energy is directly proportional to the square of the velocity.

Therefore, doubling the velocity (2v)² results in a fourfold increase in kinetic energy. 

kinetic energy (ke) = ½mv²  

if velocity is doubled → ke = ½m(2v)² = ½m(4v²) = 4 times the original.

Explanation

The right-hand rule is used to determine the direction of angular velocity.

To use it, curl your fingers of your right hand around the axis of rotation, pointing your fingers in the direction of the rotation.

Your thumb will then point in the direction of the angular velocity vector. 

Explanation

Biomass energy comes from plants, which get their energy through photosynthesis using sunlight.

So, the Sun is the original source of energy for all biomass.

Explanation

Based on the search results, Velocity is not a unit.

It is a physical quantity, specifically a vector quantity, that measures the rate of displacement. 

Meter (m): This is the SI unit of length

Time: This is a fundamental physical quantity, and its SI unit is the second (s).

Kilogram (kg): This is the SI unit of mass. 

Explanation

When a gas expands into vacuum (free expansion), it does no work and no heat is exchanged.

For an ideal gas, internal energy depends only on temperature, and since temperature remains constant, no change in internal energy occurs.

Explanation

A larger raindrop has greater mass and experiences a higher terminal velocity than a smaller drop.

Thus, large drops fall faster through air compared to small drops.