Explanation

• Fleming's left-hand rule correlates to current, magnetic field and direction of force on a conductor.
• This rule states that if the thumb, forefinger and middle finger of the left hand are stretched to be perpendicular to each other, and if the forefinger represents the direction of the magnetic field, the middle finger represents the direction of the current, then the thumb represents the direction of force.
  

Explanation

• Distance = 12 cm = 120 mm (since 1 cm = 10 mm)
• Time = 60 s
• Average speed = Distance / Time = 120 mm / 60 s = 2 mm/s = 2 mms¹
• So, the snail's average speed is indeed 2 mms¹.

Explanation

The odd one out is: final velocity = initial_velocity + (2 x acceleration x distance moved)

The other three equations are the standard equations of uniformly accelerated motion:

• 1. v = u + at (final velocity = initial velocity + acceleration x time)
• 2. s = ut + 0.5at² (distance moved = initial velocity x time + 0.5 x acceleration x time²)
• 3. v² = u² + 2as (final velocity² = initial velocity² + 2 x acceleration x distance moved)

Explanation

Explanation

For a straight wire, the induced current (I) depends on:

• The speed of movement of the wire (v): The faster the wire moves, the greater the induced current.
• The length of the wire (L): The longer the wire, the greater the induced current.
• The magnitude of the magnetic flux density (B): The stronger the magnetic field, the greater the induced current.

The induced current is given by Faraday's law of induction: I = -BLv

Where:

• I is the induced current
• B is the magnetic flux density
• L is the length of the wire
• v is the speed of movement of the wire

Explanation

When the speed of sound in water is 1500 meters per second and the reflected sound waves are detected after 0.40 seconds, the depth of water can be calculated as follows:

• depth = speed x time / 2
• depth = 1500 x 0.40 / 2
• depth = 600 meters

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

Crosslinking is a phenomenon in which a signal transmitted in one circuit or channel creates an undesired effect in another circuit or channel.

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

• Kinetic friction (fk) is the frictional force that acts on an object when it is already moving, whereas static friction (fs) is the frictional force that prevents an object from moving when a force is applied to it.
• The relationship between kinetic friction and static friction is: fk < fs
• Kinetic friction is always less than static friction because it takes less force to keep an object moving than to start it moving from rest.
• This is because the surfaces in contact have already overcome the initial resistance to motion when the object is moving, making it easier to maintain motion.