Magnetic Effects of Electric Current
- State the principle of an electric generator. Electric generator works on the principle of electromagnetic induction. Electricity is generated by rotating a coil inside magnetic field. 1
- Explain different ways to induce current in a coil. The different ways to induce current in a coil are as follows: If a coil is moved rapidly between the two poles of a horse-shoe magnet, then... 2
- What is the role of the split ring in an electric motor? The split ring in the electric motor also known as a commutator reverses the direction of current flowing through the coil after every half... 1
- What is the principle of an electric motor? The principle of an electric motor is based on the magnetic effect of electric current. A current-carrying loop experiences a force and rota... 1
- State Fleming's left-hand rule. Fleming's left hand rule states that if we arrange the thumb, the centre finger, and the forefinger of the left hand at right angles to each... 1
- A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. Correct option is d) upward 2
- In Activity 13.7 (page: 230), how do we think the displacement of rod AB will be affected if (i) current in rod AB The displacement of rod AB is increased due to magnetic force exerted on it, if : (i) If the current in the rod is increased then rod will b... 1
- Which of the following property of a proton can change while it moves freely in a magnetic field? Correct option is (c) velocity and (d) momentum 2
- The magnetic field inside a long straight solenoid-carrying current (a) is zero Correct option is d) is the same at all points 2
- The magnetic field in a given region is uniform. Draw a diagram to represent it. The magnetic field lines inside a current-carrying long straight solenoid are uniform. https://lh3.googleusercontent.com/-mxqndwiqY1I/YbYMJT... 2
- Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise Inside the loop = Pierce inside the table Outside the loop = Appear to emerge out from the table For downward direction of current flowing i... 1
- Why don't two magnetic lines of force intersect each other? The two magnetic field lines do not intersect each other because if they do it means at the point of intersect the compass needle is showing... 1
- List the properties of magnetic lines of force. The properties of magnetic lines of force are as follows. Magnetic field lines emerge from the north pole. They merge at the south pole. The... 1
- Draw magnetic field lines around a bar magnet. Magnetic field lines of a bar magnet emerge from the north pole and terminate at the south pole. Inside the magnet, the field lines emerge f... 1
- Why does a compass needle get deflected when brought near a bar magnet? The needle of a compass is a small magnet. That’s why when a compass needle is brought near a bar magnet, its magnetic field lines interact... 1