Explanation

• When light travels from a denser to a rarer medium, it bends away from the normal due to refraction.
• The production of an image by or as if by a mirror is called reflection.

Explanation

Focus is the point where the parallel beam of light rays originating from a point on the object converges.

Explanation

If mass of bob of simple pendulum increase its time period will unaffected.

As time period only depends only depends upon length of pendulum and acceleration due to gravity at that position.

$T=\sqrt[2\pi ]{2\pi \frac{l}{g}}$

$T$ = time period

$l$= length of pendulum

$g$= Acceleration at the position of simple pendulum.

Explanation

The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is 45°

Explanation

A principle in physics that states that energy can neither be created nor destroyed and that the total energy of a system by itself remains constant.

Explanation

• Gravitational potential is always negative, because it is defined as the work done per unit mass to bring an object from infinity to a given point in a gravitational field.
• Since the force of gravity is attractive, work must be done to move an object against the force of gravity, and this work is negative.

Explanation

The force exerted on a charged particle by a magnetic field is perpendicular to both the magnetic field and the velocity of the particle. This is described by the Lorentz force equation: F = q (E + v x B)

Where:

• F is the force
• q is the charge
• E is the electric field
• v is the velocity
• B is the magnetic field
• x denotes the cross product

The cross product of two vectors results in a vector that is perpendicular to both of the original vectors.

Therefore, the force due to the magnetic field and velocity is at right angles to each other.

Explanation

Progressive waves are waves that transfer energy from one point to another through a medium, such as a solid, liquid, or gas.

They are also known as mechanical waves, and examples include:

• Water waves
• Sound waves
• Seismic waves (earthquakes)

Explanation

The direction of the magnetic field around most objects or magnets is from the north pole to the south pole.

Explanation

The power factor for a pure capacitive circuit is 0.