You are here
Download the Questions here
The password to open the file is - teachooisbest
It is established that an electric current through a metallic conductor produces a magnetic field around it. Is there a similar magnetic field produced around a thin beam of moving (i) alpha particles, (ii) neutrons?
Answer
We know that moving charge is known as current.
A current carrying conductor creates a magnetic field.
Hence, magnetic field is created around the path of a moving charged particle.
-
alpha particles
Alpha particles are charged particles.
Hence, a thin beam of moving alpha particles will produce a magnetic field around it.
-
neutrons
Neutrons do not possess any charge.
Hence, a beam of moving neutrons will not produce a magnetic field around it.
What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?
Answer
A fuse is a device which is used in a circuit to prevent damage to the appliances and the circuit due to overloading.
A fuse breaks when a current higher than the current rating of the fuse flows through it.
This way, the circuit breaks and higher current does not flow in the electrical appliance, thus preventing it from being damaged.
A fuse with certain defined rating must not be replaced by one with a larger rating rating because if it is done, then the fuse with higher rating will allow more current than the permissible value without breaking.
This would lead to damage of the appliance.
Name and state the rule used to determine the direction of magnetic field produced around a straight conductor carrying conductor.
Answer
The rule used to determine the direction of magnetic field produced around a straight conductor carrying conductor is called Maxwell’s Right Hand Thumb Rule.
Let us consider a straight current carrying wire in which current flows from bottom to top.
Right hand thumb rule
Maxwell’s Right Hand Thumb Rule states that if we point the thumb of our right hand in the direction of the current.
Then the direction in which our fingers curl gives the direction of the current.
Give three uses of electromagnets.
Answer
An electromagnet is a temporary magnet whose magnetic strength can be changed.
Electromagnets have various uses
- Since electromagnets can produce very strong magnetic field, they are used commercially in electric motors.
- Electromagnets are also used in various devices such as electric bells, headphones etc.
- Electromagnets are used in Medicine - They are used for MRI Scans of the human body
