1. Why does bringing a compass needle close to a bar magnet cause it to be deflected?
1. Why does bringing a compass needle close to a bar magnet cause it to be deflected?
Explanation:
A tiny magnet serves as the compass needle. The magnetic field lines of the compass needle interact with the magnetic field lines of the bar magnet when it is brought close to it, causing the compass needle to deflect.
2. Create a circle around a bar magnet using magnetic fields.
2. Create a circle around a bar magnet using magnetic fields.
Explanation:
As seen in the graphic below, a bar magnet's magnetic field lines start at the North Pole and end at the South Pole.
3. What are the magnetic field lines' characteristics?
3. What are the magnetic field lines' characteristics?
Explanation:
These are the characteristics of magnetic field lines:
There are no points of intersection between magnetic field lines.
The South Pole is where they come to an end after leaving the North Pole.
The field lines inside the magnet run from the south pole to the north pole.
4. Imagine a wire loop lying on a table in a circular pattern. Permit the loop's current to rotate in a clockwise direction. Use the right-hand rule to find the direction of the magnetic field both within and outside the loop.
4. Imagine a wire loop lying on a table in a circular pattern. Permit the loop's current to rotate in a clockwise direction. Use the right-hand rule to find the direction of the magnetic field both within and outside the loop.
Explanation:
As the current is going downhill, the magnetic field will appear to emerge from the table outside the loop and combine with the table inside the loop. The magnetic field will appear to emerge from the table outside the loop and merge with the table inside the loop while current is flowing upward, much like it does in the image.
5. Mention the left-hand rule of Fleming.
5. Mention the left-hand rule of Fleming.
Explanation:
In accordance with Fleming's Left-hand Rule, the thumb, forefinger, and middle finger of the left hand should be positioned at right angles to one another, with the thumb pointing in the direction of the magnetic force, the forefinger pointing in the direction of the magnetic field, and the middle finger pointing in the direction of the current.
6. What governs an electric motor's operation?
6. What governs an electric motor's operation?
Explanation:
An electric motor's operation is dependent on the magnetic pull of electricity. In a magnetic field, a current-carrying conductor experiences force and rotates. The Fleming Left-hand Rule can be used to calculate which way the conductor will rotate.
7. List two safety precautions that are frequently employed in electrical circuits and equipment.
7. List two safety precautions that are frequently employed in electrical circuits and equipment.
Explanation:
The following are the safety precautions frequently employed in electrical circuits:
Fuse Each circuit needs to be linked to a fuse because a fuse stops an excessive amount of current from flowing through the circuit. The fuse melts to halt the flow of electricity and safeguard the appliance connected to the circuit when the circuit's current exceeds the maximum limit of the fuse element.
Earthing
The act of earthing shields the person from electric shock. Any current leak in an appliance is transmitted to the ground through earthing, protecting anyone using it from being electrocuted
8. Name two techniques for creating magnetic fields.
8. Name two techniques for creating magnetic fields.
Explanation:
The techniques for creating magnetic fields are as follows:
Spreading iron filings on white paper and placing a magnet underneath it will demonstrate how to create a magnetic field using a permanent magnet.
A straight conductor carrying current generates a magnetic field.
To detect the presence of a magnetic field, various conductors can be utilised, such as solenoids and circular loops.
9. A coil of copper wire that has been insulated and a galvanometer are connected. What will happen if a bar magnet is inserted into, removed from, or left inside the coil?
9. A coil of copper wire that has been insulated and a galvanometer are connected. What will happen if a bar magnet is inserted into, removed from, or left inside the coil?
Explanation:
(i)When a bar magnet is forced into the coil, an instantaneous current is generated there. Hence, there is a transient deflection in one direction of the galvanometer.
(ii) When the bar magnet is taken out of the coil, the galvanometer briefly deflects in the opposing direction, thereby producing a current in the opposing direction.
(iii) No current will be generated as long as the bar magnet is kept stationary inside the coil. It follows that the galvanometer won't deflect in any way.
10. Describe a few gadgets that utilise electric motors.
10. Describe a few gadgets that utilise electric motors.
Explanation:
Some items that utilise electric motors include:
Powered fans
water metre
Washing machines, mixers
11. An electrical short circuit happens when?
11. An electrical short circuit happens when?
Explanation:
These are two scenarios in which a short-circuit might happen:
1)The resistance of the circuit decreases when too many appliances are connected to a single socket or when high power rating appliances are connected to a light circuit. The circuit’s current increases dramatically as a result. A short circuit is the result of this circumstance.
2)A short circuit happens when live wires whose insulation has worn off come into contact with one another, causing an abrupt increase in the current flowing in the circuit.
12. What is the function of an earth wire? Why is it vital to earth metal appliances?
12. What is the function of an earth wire? Why is it vital to earth metal appliances?
Explanation:
An earth wire is used to earth the metallic bodies of electric appliances. All electrical wiring leaks are conducted to the ground using the earth wire. This prevents the user of the gadget from receiving electric shocks. This is the justification behind the necessity of earthing metallic appliances.
13. The magnetic field in a given region is uniform. Draw a diagram to represent it.
13. The magnetic field in a given region is uniform. Draw a diagram to represent it.
Explanaton:
14. In a specific area, the magnetic field is constant. Create a diagram to illustrate it.
14. In a specific area, the magnetic field is constant. Create a diagram to illustrate it.
Explanation:
Parallel straight lines that all point in the same direction are used to depict a region's uniform magnetic field.
For instance, parallel straight lines pointing from a current-carrying solenoid's S-pole to N-pole can be used to represent the solenoid's uniform magnetic field (as shown in figure).
15. Choose the correct option.
The magnetic field inside a long straight solenoid-carrying current
is zero.
decreases as we move towards its end.
increases as we move towards its end.
is the same at all points.
15. Choose the correct option.
The magnetic field inside a long straight solenoid-carrying current
is zero.
decreases as we move towards its end.
increases as we move towards its end.
is the same at all points.
Explanation:
d. is the same at all points
The magnetic field inside a long straight current-carrying solenoid is uniform. Therefore, it is the same at all points.
16. Which of the following proton characteristics can change when the particle is moving freely in a magnetic field? (There might be additional correct responses.)
Mass
Speed
Velocity
Momentum
16. Which of the following proton characteristics can change when the particle is moving freely in a magnetic field? (There might be additional correct responses.)
Mass
Speed
Velocity
Momentum
Explanation:
(c) and (d) (d)
A proton feels a magnetic pull when it enters the vicinity of a magnetic field. As a result, the proton's journey turns circular. As a result, the momentum and velocity are altered.
