Fig 3 applies to problems 7 , 8 . Recccc S Iron R I Fig 3 Switch 7 ) The switch is closed , and the lightbulb slows steadily . A permanent magnet is inserted into the solenoid Cool as shown , increasing the magnitude of the magnetic field within the solenoid 1 ) as the magnet is inserted , the bulb's brightness, by Leng's law a ) increases b) decreases ( ) remains the same 8 ) The underlying reason for your answer to a) an external agent has to push the magnet in bo ) the B field of the solenoid grills the magnet in c) the magnet has no effect