Which of the following statements correctly describe magnetic field lines around a bar magnet? 1. Outside the magnet, field lines go from North to South. 2. Inside the magnet, field lines go from North to South. 3. Magnetic field lines always form closed loops. 4. Magnetic field lines are discontinuous at the poles.
1 and 3 only
The question asks about the properties and behavior of magnetic field lines around a bar magnet. Let's evaluate each statement:
- Statement 1: Outside the magnet, field lines go from North to South.
This statement is correct. Magnetic field lines emerge from the North Pole and enter the South Pole when outside the magnet. This is the standard convention for defining magnetic field directions.
- Statement 2: Inside the magnet, field lines go from North to South.
This statement is incorrect. Inside a bar magnet, the magnetic field lines actually go from the South Pole to the North Pole. This completes the loop of the magnetic field lines, ensuring they form closed loops.
- Statement 3: Magnetic field lines always form closed loops.
This statement is correct. Magnetic field lines are continuous, and they never start or end at any point; they form closed loops. Thus, once they emerge from the North Pole of the magnet outside, they re-enter at the South Pole and continue through the magnet.
- Statement 4: Magnetic field lines are discontinuous at the poles.
This statement is incorrect. Magnetic field lines are continuous and form closed loops. They are not discontinuous at any point, including the poles.
Based on the explanations above, the statements that are correct are Statement 1 and Statement 3. Hence, the correct answer is 1 and 3 only.
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1. Both have North and South poles.
2. Both produce a nearly uniform magnetic field inside.
3. Both require permanent magnetic material only.
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Important Questions from Magnetism
How many of the following materials can be attracted by a magnet?
1. Plastic
2. Carbon
3. Aluminium
4. Stainless Steel
Select the correct answer using the code given below:
What will happen if a collection of positive and negative charges are passed at a high speed through a magnetic field which is perpendicular to the direction of motion of the charges? (Assume that both kind of charges are NOT going to recombine)
Which scientist suggested that the magnet must also exert an equal and opposite force on the current-carrying conductor?
Paramagnetic substances are-
The magnetic field lines produced inside a long current-carrying solenoid is similar to that of a:
