When is the force experienced by a current–carrying conductor placed in a magnetic field largest?

Which of the following is a key application where temporary magnetism is crucial?

A compass needle deflects when brought near a current-carrying wire because:

The force between two parallel current-carrying wires depends on:

What material is typically used to insulate the wire in an electromagnet coil?

The region where magnetic field lines are closest together indicates:

Which animal uses Earth's magnetic field for navigation?

A simple electric bell uses an electromagnet to:

If you reverse the battery terminals connected to an electromagnet, what happens?

The magnetic poles always exist in:

Why are electromagnets preferred over permanent magnets in devices like magnetic separation machines?

How does the Earth's magnetic field protect us?

The magnetic field produced by a current-carrying wire is directly proportional to the:

Which effect of electric current is responsible for the working of an electric fan?

The direction of the magnetic field lines inside a bar magnet is from:

The magnetic field lines inside a solenoid are concentrated, indicating:

What would happen if you used an insulator as the core for an electromagnet?

If a magnet is broken into two pieces, each piece will:

A galvanometer is a device used to:

For Class 8, which simpler concept is often used to describe the strength of a magnetic field qualitatively?

Which of the following is an example of a natural magnet?

What is the main characteristic that makes an electromagnet different from a permanent magnet?

In a DC motor, the carbon brushes are used to:

The magnetic effect of electric current was first observed by accident during experiments with:

What type of core would make the strongest electromagnet?

If you increase the current in an electromagnet, its lifting power will:

The pattern of magnetic field lines around a straight current-carrying wire is:

A device that uses the magnetic effect of electric current to make or break a circuit is called a:

Which of these components is found in an electric motor?

The North pole of a compass needle is actually attracted to what kind of magnetic pole?

An electromagnet is useful because it allows us to:

The magnetic field lines never intersect each other because:

The force experienced by a current-carrying conductor in a magnetic field depends on:

What is the effect of changing the direction of current in a wire on the magnetic field around it?

When current flows through a circular loop, the magnetic field lines are densest:

A solenoid with more turns of wire will produce a ____________ magnetic field for the same current.

If you wind a coil of wire around a soft iron core and pass current through it, what have you created?

The magnetic effect of electric current is used in:

Which of these substances is NOT used to make a magnet?

A current-carrying conductor produces a magnetic field that is ___________ to the direction of current.

What kind of energy transformation occurs in an electric bell?

The strength of an electromagnet can be increased by:

Which of the following is a common use of an electromagnet in homes?

A magnetic field can pass through:

What happens to the magnetic field lines near the poles of a magnet?

If a current-carrying wire is placed North-South, and current flows from North to South, what will be the direction of the magnetic field directly to the East of the wire?

Magnetic field lines point from which pole to which pole outside a magnet?

What happens if you try to make an electromagnet without an iron core, just using a coil of wire?

Which of these is a temporary magnet?

To hold a car door shut, a device sometimes uses an electromagnet. This is because:

When a compass needle is placed exactly at the center of a current-carrying circular coil, it will align:

An electric current produces a magnetic field. This field can be detected by using a:

How can you increase the strength of an electromagnet without adding more turns to the coil?

The magnetic field lines inside a current-carrying solenoid are generally:

The magnetic poles of an electromagnet are determined by the:

Which of the following is a disadvantage of a permanent magnet compared to an electromagnet?

When the current in an electromagnet is turned off, what happens to its magnetic field?

If an electromagnet is made with a steel core instead of a soft iron core, what would be the likely outcome?

What is the role of a commutator in a DC motor?

The principle on which an electric motor works is:

An electric motor converts:

The strength of the magnetic field produced by a current-carrying conductor depends on the:

When a current flows through a circular loop of wire, the magnetic field lines inside the loop are:

A magnetic compass is used to determine:

In the Right-Hand Thumb Rule, if the current flows upwards, the magnetic field lines will be in which direction?

Which of the following is essential for the operation of an electromagnet?

The magnetic field lines outside a current-carrying solenoid are similar to those of a:

What is the effect on the magnetic field inside a solenoid if an iron core is inserted?

The North pole of a compass needle points towards the Earth's:

The Earth itself acts like a giant:

What is the primary function of the switch in an electric bell circuit?

Which material would you choose to make a permanent magnet?

The poles of an electromagnet can be reversed by:

When current flows through a solenoid, it behaves like a:

A solenoid is essentially a:

Which of the following devices relies on the magnetic effect of current to operate?

In an electric bell, the hammer strikes the gong when:

What happens to the magnetic field strength of an electromagnet if the current passing through its coil is doubled?

The magnetic field lines around a straight current-carrying conductor are:

When an electric current flows through a wire, the magnetic field produced around it is in the form of:

Which property makes soft iron suitable for the core of an electromagnet?

What happens to a compass needle if you bring a strong electromagnet close to it with the current on?

A current-carrying wire placed in a magnetic field experiences a:

Which type of magnet is typically stronger and can be controlled?

A key difference between a permanent magnet and an electromagnet is that an electromagnet:

If you hold a current-carrying wire in your right hand with your thumb pointing in the direction of the current, your curled fingers indicate the direction of the:

The direction of the magnetic field lines around a straight current-carrying conductor can be found using the:

Large cranes in junkyards use electromagnets to lift heavy objects because:

How does an electric bell work using an electromagnet?

Which device uses an electromagnet?

An electromagnet loses its magnetism when:

Which of the following does NOT affect the strength of an electromagnet?

To make an electromagnet stronger, one can:

What material is commonly used as the core of an electromagnet?

What is an electromagnet?

The phenomenon where an electric current produces a magnetic field around it is called the:

What did Oersted observe when current flowed through a wire placed near a compass?

Who discovered that electric current produces a magnetic field?

The region around a magnet where its influence can be detected is called:

Which material is attracted by a magnet?

What happens to a compass needle when placed near a bar magnet?

Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?

List two methods of producing magnetic fields.

At the time of short circuit, the current in the circuit (a) reduces substantially. (b) does not change. (c) increases heavily. (d) vary continuously

Which of the following correctly describes the magnetic field near a long straight wire? (a) The field consists of straight lines perpendicular to the wire. (b) The field consists of straight lines parallel to the wire. (c) The field consists of radial lines originating from the wire. (d) The field consists of concentric circles centred on the wire

List the properties of magnetic field lines.

Why does a compass needle get deflected when brought near a bar magnet?

Define the term induced electric current.

State the effect of a magnetic field on the path of a moving charged particle.

Write the frequency of alternating current (AC) in India. How many times per second it changes its direction?

Explain why alternating current is preferred over direct current for transmission over long distances.

Define alternating current and direct current.

Mention the frequency of D.C that is given by a cell.

Alternating current has a frequency of 50 Hz. What is meant by this statement? How many times does it change its direction in one second? Give reason for your answer

Mention and explain the function of an earth wire. Why it is necessary to earth metallic appliances?

Fuse acts like a watchman in an electric circuit. Justify this statement.

List three methods of producing a magnetic field.

What precaution should be taken to avoid the overloading of the domestic electric circuit?

Electric appliances like electric -press, toaster, fans etc are connected to electric mains through three-pin plug. Why?

What is the function of an earth wire? Why is it necessary to earth metallic casing of electric appliances?

A current-carrying straight conductor is placed in the east-west direction. What will be the direction of the force experienced by this conductor due to earth’s magnetic field? How will this force get affected?

Why is the earth pin thicker and longer than the live and the neutral pins?

When does an electric short circuit occur?

When is the force experienced by a current-carrying conductor placed in magnetic field largest?

State the principle of an electric generator.

What is the role of the split ring in an electric motor?

State and define S.I unit of magnetic field?

What is an electromagnet? Write two uses of an electromagnet?

State the factors on which strength of magnetic field at a point due to a current carrying conductor depends?

What is electric fuse? Where is it connected in a circuit?

Name and state rule used to determine the direction of magnetic field produced around a straight conductor carrying current?

Why do not two magnetic field lines intersect each other?

Write two ways to induce current in a coil?

Why does a compass needle deflect when brought near a bar magnet?

State two properties of magnetic lines of force?

In Faradays experiment if instead of moving the magnet towards the coil we move the coil towards the magnet. Will there be any induced current? Justify your answer. Compare the two cases.

If field lines of a magnetic field are crossed at a point, what does it indicate ?

What is meant by magnetic field?