GEOLOGY

Detailed explanation-1: -As we away from the magnet, the strength of the magnetic field decreases as the number of magnetic field lines passing through particular area decreases.

Detailed explanation-2: -Magnetic Fields Varying as an Inverse Cube For both monopoles and dipoles, the field strength decreases as the distance from the source increases., often called the inverse square law. For electric dipoles, the field strength decreases more rapidly with distance; as R-3 .

Detailed explanation-3: -The strength of the magnetic field is proportional to the current in the coil. If the current in the coil decreases then the strength of the magnetic field decreases.

Detailed explanation-4: -Assertion: The magnetic field is stronger at a point which is nearer to the conductor and goes on decreasing on moving away from the conductor. Reason: The magnetic field B produced by a straight current carrying wire is inversely proportional to the distance from the wire.

Detailed explanation-5: -Increase the number of turns. Increase the strength of current flow. Use soft iron as the core. Increase the area of cross section of the solenoid.