Explanation

• Electromagnets require an electric current to generate a magnetic field.
• Whereas bar magnets are permanent magnets that do not require electricity to exhibit magnetism.
• This is the main difference between the two types of magnets.

Explanation

Explanation

• During Summer in the Northern Hemisphere, the days become longer and the nights become shorter due to the Earth's axis being tilted towards the Sun.
• This results in more direct sunlight and longer periods of daylight.

Explanation

• An open circuit is an electrical circuit that is broken or disconnected, and electricity cannot flow.
• When the wire is disconnected, the circuit is open, and the bulb is off.

Explanation

When a projectile moves upward, gravity acts downward.

This opposes the vertical motion, so the vertical component of velocity decreases until it becomes zero at the highest point.

Explanation

Eddy currents are circular currents induced in conductors when exposed to a changing magnetic field.

They flow in loops perpendicular to the magnetic flux that induces them.

Explanation

 The combined effect of resistance and reactance in an electrical circuit is known as impedance.

Impedance, denoted by the letter 'Z',

Represents the total opposition to the flow of alternating current (AC) in a circuit.

It encompasses both resistance (opposition to current flow due to the material's properties) and reactance (opposition due to capacitance and inductance). 

Explanation

 At high frequencies, an RLC series circuit behaves like an RL circuit. 

At high frequencies, the inductive reactance (XL) becomes very large compared to the capacitive reactance (XC).

This means the circuit is dominated by the inductive behavior.

The circuit essentially behaves like a combination of a resistor and an inductor. 

Explanation

The net electric field is zero inside any conductor with a static charge.

Explanation

The correct statement for a nuclear reactor is: "Moderator slow down the neutron."