Magnetic Effects of Electric Current — Class 10 Physics NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 10 Physics chapter "Magnetic Effects of Electric Current" — 10 important questions with detailed answers for CBSE board exam preparation.
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TL;DR: Free step-by-step NCERT solutions for Class 10 Physics chapter "Magnetic Effects of Electric Current" — 10 important questions with detailed answers f…
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Key Questions Covered:
- Draw magnetic field lines around a bar magnet. List any three important prope…
- A straight conductor carries current vertically upwards. What is the directio…
- How does the magnetic field inside a current-carrying solenoid compare to tha…
- A straight conductor is placed perpendicular to a uniform magnetic field. Whe…
- State the principle of an electric motor. Explain the role of a split-ring co…
- Describe an experiment to demonstrate electromagnetic induction. What factors…
- + 4 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Draw magnetic field lines around a bar magnet. List any t… | ✓ Solved |
| A straight conductor carries current vertically upwards. … | ✓ Solved |
| How does the magnetic field inside a current-carrying sol… | ✓ Solved |
| A straight conductor is placed perpendicular to a uniform… | ✓ Solved |
| State the principle of an electric motor. Explain the rol… | ✓ Solved |
| Describe an experiment to demonstrate electromagnetic ind… | ✓ Solved |
Showing 6 of 10 questions
Q1: Draw magnetic field lines around a bar magnet. List any three important properties of these magnetic field lines.
1. **Drawing Magnetic Field Lines:**
Imagine a bar magnet with a North (N) pole and a South (S) pole. The magnetic field lines emerge from the North pole and enter the South pole outside the magnet. Inside the magnet, they travel from the South pole to the North pole, forming continuous closed loops.
(Since I cannot draw, mentally visualize this: lines curving out from N, entering S, and continuing straight from S to N inside the magnet.)
2. **Properties of Magnetic Field Lines:**
...
Q2: A straight conductor carries current vertically upwards. What is the direction of the magnetic field at a point: (a) to the east of the conductor? (b) to the west of the conductor?
To determine the direction of the magnetic field around a straight current-carrying conductor, we use the **Right-Hand Thumb Rule**.
**Steps using Right-Hand Thumb Rule:**
1. **Hold the conductor:** Imagine holding the straight conductor in your right hand.
2. **Point the thumb:** Your thumb should point in the direction of the current. In this case, the current is flowing vertically upwards.
3. **Curl the fingers:** Your fingers will curl around the conductor in the direction of the magneti...
Q3: How does the magnetic field inside a current-carrying solenoid compare to that of a bar magnet? List two factors on which the strength of the magnetic field produced by a solenoid depends.
1. **Comparison of Magnetic Field:**
* A current-carrying solenoid produces a magnetic field similar to that of a bar magnet. Both have a North pole at one end and a South pole at the other.
* The magnetic field lines inside a solenoid are nearly parallel to the axis of the solenoid and are uniformly distributed. This indicates that the magnetic field is **uniform and strong** inside the solenoid, much like the magnetic field within a bar magnet (though we usually visualize the exte...
Q4: A straight conductor is placed perpendicular to a uniform magnetic field. When a current flows through the conductor, it experiences a force. If the direction of current is reversed, what happens to the direction of the force? State the rule used to determine the direction of force.
1. **Effect of Reversing Current on Force Direction:**
When the direction of the current flowing through the conductor is reversed, the direction of the force experienced by the conductor will also be **reversed**.
* **Reasoning:** The direction of the force on a current-carrying conductor in a magnetic field depends on both the direction of the current and the direction of the magnetic field. This relationship is described by Fleming's Left-Hand Rule. If one of these (current or fie...
Q5: State the principle of an electric motor. Explain the role of a split-ring commutator in a DC electric motor.
1. **Principle of an Electric Motor:**
An electric motor works on the principle that when a current-carrying conductor is placed in a magnetic field, it experiences a force. If the conductor is arranged in the form of a coil and placed between the poles of a magnet, the forces on the opposite sides of the coil act in opposite directions, causing the coil to rotate continuously.
In simpler terms: **Electrical energy is converted into mechanical energy (rotational motion).**
2. **Role o...
Q6: Describe an experiment to demonstrate electromagnetic induction. What factors affect the magnitude of the induced current?
1. **Experiment to Demonstrate Electromagnetic Induction:**
**Aim:** To demonstrate that a current can be induced in a coil by changing the magnetic field around it.
**Materials:** A coil of wire, a strong bar magnet, a sensitive galvanometer.
**Procedure:**
a. Connect the two ends of the coil of wire to a galvanometer. The galvanometer is used to detect the presence and direction of current.
b. **First Observation:** Take the bar magnet and rapidly **move its North pole...
Showing 6 of 10 questions. Visit the full page for complete solutions.