Physics
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
Answer
both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because the strength of magnetic field of an electromagnet can be increased by the following two ways :
(i) by increasing the number of turns of winding in the solenoid, and
(ii) by increasing the current through the solenoid.
Reason (R) is true because on increasing the number of turns of winding in the solenoid, the magnetic field strength of an electromagnet also increases and vice versa and hence, reason correctly explains the assertion.
Related Questions
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) : 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
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
Assertion (A) : Neutral points are the points at which two magnetic fields are equal in magnitude and in the same direction.
Reason (R) : The net magnetic field at a neutral point is zero.
- 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