uw die speed of rotation of motor is increased?
3. Justify the following
(a) Two magnetic field lines never intersect each other
(b) Magnetic field lines are closed curve
(C) A permanent magnet electromagnet using a scienoid
is as shown below under what condition permanent
electromagnet is obtained, if a current carrying solenoid is
used
Answers
Answer:
A. Two magnetic field lines can never intersect each other, because if tangent drawn to the field lines then it will have two direction of magnetic field at the same point of intersection which is not possible, since magnetic field line have only one direction at a particular point.
B. Magnetic field lines are continuous curves, which are originate from North pole and terminate on south pole. Inside the magnet it moves from south pole to north pole forming a closed loop. so, there is no any origination or termination point like electric field.
C. The conditions to obtain permanent electromagnet as following if a current carrying solenoid is used are (i) The current through the solenoid should be direct current. (ii) The rod inside is made of a magnetic material such as steel.