NCERT Class 10 Science — Chapter 4: Magnetic Effects of Electric Current

If a circular coil has 'n' turns and carries a current 'I', how does the magnetic field produced compare to that of a single turn carrying the same current?

Which rule is used to find the direction of the force acting on a current-carrying conductor placed in a magnetic field?

Consider the magnetic field around a current-carrying straight conductor. Which of the following statements are correct? 1. At a fixed point, the field increases when the current increases. 2. At a fixed current, the field strength remains constant regardless of distance from the wire. 3. The field consists of radial lines emerging from the wire. 4. The field consists of concentric circles around the wire.

What is the frequency of the alternating current (AC) supplied to households in India?

Assertion (A): The magnetic field lines around a straight current-carrying wire are straight lines parallel to the wire. Reason (R): The direction of the magnetic field reverses if the direction of the current is reversed.

Which rule determines the direction of the force experienced by a current-carrying conductor placed in a magnetic field?

A long straight wire carries current from south to north. Using the right-hand thumb rule, the magnetic field directly to the east of the wire points:

In standard domestic electric circuits, what is the colour of the insulation used for the earth wire?

Assertion (A): The magnetic field is stronger near the poles of a magnet. Reason (R): The magnetic field lines are widely spaced near the poles.

Which of the following changes will increase the displacement of a current-carrying rod in a uniform magnetic field? 1. Increasing the current reduces the displacement of the rod. 2. Using a stronger magnet. 3. Increasing the effective length within the field has no effect on displacement. Which of the statements given above is/are correct?

Which safety device is used in electric circuits to prevent damage caused by overloading or short-circuiting?

With reference to magnetic field lines, consider the following statements: 1. Outside a magnet, they are taken to originate from the north pole and terminate at the south pole. 2. Inside a magnet, they run from the south pole to the north pole. 3. The closeness of lines is independent of the relative strength of the field. 4. Two magnetic field lines can intersect at a point. Which of the statements given above is/are correct?

In domestic electric circuits, which colour of insulation is typically used for the earth (protective) wire?

Assertion (A): The direction of force on a current-carrying conductor is reversed if the direction of the current is reversed. Reason (R): The magnitude of the force depends on the strength of the magnetic field.

In electromagnetism, the Right-Hand Thumb Rule used to determine the direction of the magnetic field around a current-carrying conductor is also known as:

Which medical imaging technique relies on strong magnetic fields and radio waves?

According to Fleming’s Left-Hand Rule, what does the forefinger represent?

What is the standard potential difference between the live wire and the neutral wire in domestic power supply in India?

Which rule is used to determine the direction of the magnetic field around a straight current-carrying conductor?

What is the nature of the magnetic field lines inside a long current-carrying solenoid?

Assertion (A): Magnetic field is a vector quantity. Reason (R): Magnetic field lines are closer together where the magnetic field is strong.

Which rule is used to determine the direction of the magnetic field lines around a straight current-carrying conductor?

Assertion (A): A current-carrying solenoid behaves like a bar magnet. Reason (R): The magnetic field pattern produced by a solenoid is identical to that of a bar magnet.

Assertion (A): Two magnetic field lines can intersect each other if the field is strong enough. Reason (R): If field lines intersected, the compass needle at the intersection would point in two directions simultaneously.

Assertion (A): A current-carrying conductor experiences maximum force when placed parallel to the magnetic field. Reason (R): The direction of the force is given by Fleming's Left-Hand Rule.

A positively charged particle projected towards the west is deflected towards the north by a magnetic field. The direction of the magnetic field is:

Assertion (A): Household appliances are connected in parallel to the mains supply. Reason (R): Parallel connection ensures that each appliance receives the same voltage.

Assertion (A): Inside a bar magnet, magnetic field lines run from the South pole to the North pole. Reason (R): Like magnetic poles repel each other while unlike poles attract.

Assertion (A): The metallic body of an electric appliance is connected to the earth wire. Reason (R): The earth wire provides a high resistance path for the current.

Assertion (A): The magnetic field produced by a current-carrying straight wire decreases as the distance from the wire increases. Reason (R): The magnetic field strength is directly proportional to the distance from the wire.

Match List I with List II and select the correct answer using the code given below the lists: List I (Rule/Phenomenon) | List II (Indication/Characteristic) A. Right-hand thumb rule | 1. Direction of magnetic field associated with a current-carrying conductor B. Fleming’s left-hand rule | 2. Direction of force on a current-carrying conductor in a magnetic field C. Magnetic field due to straight conductor | 3. Concentric circles centered on the wire D. Magnetic field inside a solenoid | 4. Uniform and parallel field lines

Which among the following is the most direct observable consequence of a current-carrying conductor placed in a transverse magnetic field?

What does the relative closeness of magnetic field lines in a region indicate?

Which of the following statements about an electric fuse in domestic circuits is/are correct? 1. It prevents damage by interrupting excessive current. 2. It operates by heating and melting. 3. It increases the circuit resistance under normal load. 4. It protects against overloading but not against short-circuits.

A magnetic compass needle works on the principle of which of the following components?

What is the nature of the magnetic field inside a long straight current-carrying solenoid?

A coil consisting of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder is called a: