Class 9 Science Questions and Answers on Magnetism and Electromagnetism
This worksheet is for class 9 Science, comprising the topic of magnetism and electromagnetism. It is important to understand these scientific terms as they aid in understanding further concepts of higher classes.
After completing this worksheet, students will be able to have a better understanding of the following topics:
- What is magnetism?
- What is electromagnetism?
- What is a magnetic field?
- What is the left-hand rule?
- What is the right-hand rule?
What is magnetism?
It is a physical phenomenon caused by the movement of electric charge between objects, resulting in attraction and repulsive forces.
What is electromagnetism?
The electromagnetic force, a sort of physical interaction that happens between electrically charged particles, is studied in electromagnetism, a field of physics.
- ____________ is a magnetic material.
- The ____________ is used to step up or step down voltage.
- What is a magnetic field?
- The transformer’s primary coil is coupled to ____________.
- Electric motor converts ________ into __________.
- _________ is a natural magnet.
- A freely suspended magnet will point in __________ direction.
- What is a magnetic field? Draw a diagram to explain the same.
- Explain the right-hand thumb rule.
- Explain the Fleming’s left-hand rule.
- Write a short note on Galvanometer.
- Explain the working of an Electric motor.
- A magnetic field is an area around a magnet where the magnet’s effect can be felt.
- An AC source.
- Electrical energy into mechanical energy.
- North-south direction
A magnetic field is an area around a magnet where the magnet’s effect can be felt.
A magnetic field is a quantity that has both a magnitude and a direction. The magnetic field’s direction is assumed to be the direction in which a compass needle’s north pole moves within it. As a result, it is assumed that the field lines emerge from the north pole and merge at the south pole.
It is a simple method for determining the magnetic field direction associated with a current-carrying conductor. Assuming that we’re holding a current-carrying straight conductor in our right hand, with the thumb pointing in the direction of the current. Then, as shown in the figure above, the finger would get wrapped around the conductor in the direction of the magnetic field’s field lines.
The direction of the current and the magnetic field are perpendicular to each other and the force is perpendicular to both current and the magnetic field.
A simple rule known as Fleming’s left-hand rule is used to illustrate the three directions. By stretching the left hand’s thumb, forefinger, and middle finger, the alignment can be such that they become mutually perpendicular, as shown in the figure above. The thumb points in the direction of motion or force exerted on the conductor if the first finger is pointing in the direction of the magnetic field and the second finger is pointing in the direction of the current.
- A galvanometer is a device for detecting the presence of electricity in a circuit. When there is no current flowing through the scale, the pointer remains at zero (the scale’s centre). Depending on the direction of the current, it can deflect to the left or right of the zero mark.
The operation of an electric motor is based on the fact that a current-carrying conductor generates a magnetic field around it.
- It has two bar magnets such that their poles face each other with a small gap between them.
- There is a loop of conducting wire between the spaces.
- The loop’s ends are attached to the battery connections.
- When electricity flows through the loop, the loop turns.
The magnetic field produced by the magnets interferes with the magnetic field produced by the electric current flowing in the conductor. Since the loop becomes a magnet, one side of it gets drawn to the magnet’s north pole and the other to the south pole. This causes the loop to rotate indefinitely. An electric motor operates on this principle.
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