A solenoid having an iron core has its terminals connected across an ideal D.C. source. If the iron core is removed the current flowing through solenoid

Field inside a solenoid is A Directly proportional to the current flowing through the coil B Directly proportional to its length C Inversely porportional to total number of turns. D Inversely proportional to current.

Describe the magnetic field of a solenoid.

The strength of magnetic field inside a long current carryingstraight solenoid is(a) more at the ends than at the centre(b) minimum in the middle(c) same at all points(d) found to increase from one end to the other

A bar magnet is moved towards a solenoid which is connected to a sensitive ammeter.  Which of the following will NOT occur as the magnet is moved towards the solenoid?A potential difference is induced across the solenoidThe lines of magnetic flux (magnetic field lines) of the bar magnet cut through the solenoidEnergy will be transferred from the bar magnet to the charges in the solenoidAn alternating current flows through the solenoid2Which of the following is NOT used in the construction of a transformer?A primary coilA soft magnetic coreA resistorA secondary coil3Which of the following statements is incorrect?When direct current is supplied to the primary coil of a transformer, an alternating magnetic field is produced around it (and within the core)The changing (alternating) magnetic field within the core of a transformer causes an alternating potential difference to be induced across the secondary coilIn a step-down transformer, there are fewer turns on the secondary coil than on the primary coilIn a step-up transformer, there are more turns on the secondary coil than on the primary coil4An alternating potential difference of 240 V is applied across the primary coil of a transformer.  If there are 600 turns on its primary coil and 30 turns on its secondary coil, calculate the potential difference across its secondary coil.12 V75 V4,800 V (4.8 kV)4,320,000 V (4.32 MV)5There are 1000 turns on the secondary coil of a step-up transformer and there is a potential difference of 2 kV across it.  There are 50 times fewer turns on its primary coil.  Calculate the potential difference across its primary coil.0.04 V0.1 V40 V100 V

A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube 2 m long and 0.2 m in diameter. The magnetic intensity at the center of the solenoid when a current of 2 A flows through it is: