Physics
Assertion (A) : Two bar magnets attract when they are brought near to each other with the same pole.
Reason (R) : Unlike poles attract each other.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Answer
assertion is false but reason is true
Explanation
Assertion (A) is false because like poles (e.g., north-north or south-south) repel each other and only unlike poles (north-south) attract so two bar magnets will always repel each other when brought near with the same pole.
Reason (R) is true because it is a correct observed behavior of magnets where only unlike poles (N-S) attract each other while similar poles like N-N or S-S repel each other.
Related Questions
The magnetic polarity at the two ends of a horse-shoe magnet depends on :
- the strength of current in the coil
- the number of turns in the coil
- the material on which the coil is wound
- the direction of current at the ends of the magnet.
The figure depicting the correct magnetic field lines when the magnet is placed with its south pole pointing towards north is :
- 1.
- 2.
- 3.
- 4.
Assertion (A) : Strength of an electromagnet can be increased by increasing the number of turns of winding on solenoid.
Reason (R) : Magnetic field strength is directly proportional to number of turns on the solenoid.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Assertion (A) : Magnetic field lines never intersect each other.
Reason (R) : At a particular point, magnetic field has only one direction.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false