CBSE Class 10 Science Magnetic Effects of Electric Current Worksheet Set 11

This printable Class 10 Science worksheet on Magnetic Effects of Electric Current has 18 short questions with answers: fill-in-the-blanks, true or false statements and very short answer questions on magnets, field lines, the field of a current-carrying wire and the compass needle. It has no diagrams so that it prints cleanly.

Fill in the Blanks

Question 1. A compass needle is a ______ magnet.
Answer:
small magnet.
In simple words: A compass needle is a small magnet.

Teacher's Note:
1. Write only the missing word or phrase.
2. Learn this fact for quick recall.

Question 2. Field lines are used to represent a ______.
Answer:
magnetic field.
In simple words: Field lines show the magnetic field.

Teacher's Note:
1. Write only the missing word or phrase.
2. Learn this fact for quick recall.

Question 3. Field lines are shown closer together where the magnetic field is ______.
Answer:
stronger (greater).
In simple words: Close lines mean a strong field.

Teacher's Note:
1. Write only the missing word or phrase.
2. Learn this fact for quick recall.

Question 4. A metallic wire carrying an electric current has associated with it a ______ field.
Answer:
magnetic field.
In simple words: Current produces a magnetic field.

Teacher's Note:
1. Write only the missing word or phrase.
2. Learn this fact for quick recall.

Question 5. The field lines about the wire consist of a series of concentric circles whose direction is given by the ______ rule.
Answer:
right-hand thumb rule.
In simple words: Right-hand thumb rule gives the field direction.

Teacher's Note:
1. Write only the missing word or phrase.
2. Learn this fact for quick recall.

Question 6. The magnetic lines of force are the lines drawn in a magnetic field along which a free ______ pole would move.
Answer:
north pole.
In simple words: A free north pole moves along the field line.

Teacher's Note:
1. Write only the missing word or phrase.
2. Learn this fact for quick recall.

Question 7. An electric current can be used for making temporary magnets known as ______.
Answer:
electromagnets.
In simple words: Temporary magnets made by current are electromagnets.

Teacher's Note:
1. Write only the missing word or phrase.
2. Learn this fact for quick recall.

Question 8. The unit of magnetic field is ______.
Answer:
tesla.
In simple words: Magnetic field is measured in tesla.

Teacher's Note:
1. Write only the missing word or phrase.
2. Learn this fact for quick recall.

Question 9. Magnetic poles always exist in ______.
Answer:
pairs (a north pole and a south pole together).
In simple words: A magnet always has two poles.

Teacher's Note:
1. Write only the missing word or phrase.
2. Learn this fact for quick recall.

True or False (Give the Correct Statement if False)

Question 10. An electron and a proton move in a uniform magnetic field with the same speed perpendicular to the magnetic field. They experience forces in opposite directions differing by a factor of 1840.
Answer:
False. The forces are equal in magnitude, because the charges are equal in size and the speed is the same; they are opposite in direction.
In simple words: An electron and a proton experience equal and opposite forces.

Teacher's Note:
1. Give the correct statement for any false answer.
2. Think of the underlying rule before answering.

Question 11. A positive charge projected along the axis of a current carrying solenoid moves undeviated from its original path.
Answer:
True. The field inside the solenoid is along its axis, so a charge moving along the field feels no force.
In simple words: No force acts on a charge moving along the field.

Teacher's Note:
1. Give the correct statement for any false answer.
2. Think of the underlying rule before answering.

Question 12. A magnetic field exists in the region surrounding a magnet, in which the force of the magnet can be detected.
Answer:
True. This is the definition of the magnetic field.
In simple words: This is the definition of a magnetic field.

Teacher's Note:
1. Give the correct statement for any false answer.
2. Think of the underlying rule before answering.

Question 13. The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor.
Answer:
True. A straight wire gives concentric circles, a loop gives circles that become straight at the centre, and a solenoid gives a bar magnet pattern.
In simple words: The shape of the conductor decides the field pattern.

Teacher's Note:
1. Give the correct statement for any false answer.
2. Think of the underlying rule before answering.

Question 14. A current-carrying conductor when placed in a magnetic field always experiences a force.
Answer:
False. There is no force when the conductor is parallel to the field; the force is largest when it is perpendicular.
In simple words: No force acts when the conductor is parallel to the field.

Teacher's Note:
1. Give the correct statement for any false answer.
2. Think of the underlying rule before answering.

Question 15. The direction of force on a current carrying conductor placed in a magnetic field can be reversed by reversing the direction of current flowing in the conductor.
Answer:
True. Reversing the current reverses the force.
In simple words: Reversing the current reverses the force.

Teacher's Note:
1. Give the correct statement for any false answer.
2. Think of the underlying rule before answering.

Very Short Answer Questions

Question 16. Define magnetic field of bar magnet.
Answer:
The region around the bar magnet in which the magnetic force due to the bar magnet can be experienced is called its magnetic field.
In simple words: The space around a magnet where its force is felt.

Teacher's Note:
1. Define with the word force.
2. Magnetic field is a vector.

Question 17. Why are magnetic field lines more crowded towards the pole of a magnet?
Answer:
The crowding of field lines shows that the magnetic field is strong there, and the field of a magnet is strongest near its poles.
In simple words: Crowded lines mean a strong field, which is near the poles.

Teacher's Note:
1. Closeness of lines shows strength.
2. The field is strongest at the poles.

Question 18. Why does a compass needle show deflection when brought near a current carrying conductor?
Answer:
A current-carrying conductor produces a magnetic field around it.
The compass needle is a small magnet; the field exerts a force on it and deflects it.
In simple words: The current's magnetic field turns the needle.

Teacher's Note:
1. This was Oersted's discovery.
2. A compass needle is a small magnet.