Magnetic Effects of Electric Current: Class 10 Science Q&A · Page 3
51 free answers on Magnetic Effects of Electric Current (Science) for Class 10 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- ScienceClass 10CBSE
What is the role of split ring in an electric motor?
Solution: The split ring plays the role of a commutator in an electric motor. The commutator reverses the direction of the current flowing through the coil after each half-rotation of the coil. Due to this reversal of current, the coil continues to rotate in the same direction.
- ScienceClass 10CBSE
What is the principle of an electric motor?
Solution: The working principle of an electric motor is based on the magnetic effect of current. A current-carrying conductor, when placed in a magnetic field, experiences force and rotates. The direction of the rotation of the conductor can be determined by Fleming’s Left-hand rule.
- ScienceClass 10CBSE
State Fleming’s left-hand rule.
Solution: Fleming’s Left-hand rule states that if we arrange our thumb, forefinger and middle finger of the left hand at right angles to each other, then the thumb points towards the direction of the magnetic force, the forefinger points towards the direction of the magnetic field and the middle finger points towards the direction of the current.
- ScienceClass 10CBSE
A positively-charged particle (alpha-particle) projected towards the west is deflected towards north by a magnetic field. The direction of magnetic field is 1. towards south 2. towards east 3. downward 4. upward
Solution: The direction of the magnetic field can be determined using Fleming’s Left-hand rule. According to the rule, if we arrange our thumb, forefinger and the middle finger of the left hand right perpendicular to each other, then the thumb points towards the direction of the magnetic force, the middle finger the direction of current and the forefinger the direction of magnetic field. Since the direction of the positively charged particle is towards the west, the direction of
- ScienceClass 10CBSE
In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased; (ii) a stronger horse-shoe magnet is used; and (iii) length of the rod AB is increased?
Solution: A current-carrying conductor, when placed in a magnetic field, experiences force. The magnitude of this force will increase with the increase in the amount of current, the length of the conductor and the strength of the magnetic field. Hence, the strength of the magnetic force exerted on the rod AB and its displacement will increase if The current in rod AB is increased A stronger horseshoe magnet is used When the length of the rod AB incre
- ScienceClass 10CBSE
Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer.) 1. Mass 2. Speed 3. Velocity 4. Momentum
(c) and (d) When a proton enters the region of a magnetic field, it experiences a magnetic force. Due to this, the path of the proton becomes circular. As a result, the velocity and the momentum change.
- ScienceClass 10CBSE
Choose the correct option. The magnetic field inside a long straight solenoid-carrying current 1. is zero. 2. decreases as we move towards its end. 3. increases as we move towards its end. 4. is the same at all points.
Solution: 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.
- ScienceClass 10CBSE
Why don’t two magnetic field lines intersect each other?
If two magnetic field lines intersect, then at the point of intersection, the compass needle shows two different directions, which is not possible. Hence they do not intersect with each other.
- ScienceClass 10CBSE
List the properties of magnetic field lines.
Solution: The properties of magnetic field lines are as follows: Magnetic field lines do not intersect with each other. They emerge from the North Pole and terminate at the South Pole. Inside the magnet, the direction of the field lines is from the South Pole to the North Pole.
- ScienceClass 10CBSE
Why does a compass needle get deflected when brought near a bar magnet?
The compass needle is a small magnet. When the compass needle is brought close to a bar magnet, the magnetic field lines of the compass needle interact with the magnetic field lines of the bar magnet, which causes the compass needle to deflect.
- ScienceClass 10All
What is a cell in a battery?
A cell in a battery is an electrochemical device that converts stored chemical energy into electrical energy through controlled chemical reactions between different materials. Each battery cell consists of three essential components: two electrodes (an anode and a cathode) made from different materials, and an electrolyte that allows ions to move between the electrodes while preventing direct electrical contact. When a circuit is connected, chemical reactions occur at both electrodes simultan