What is a solenoid? Draw the magnetic field pattern of (i) a current-carrying solenoid and (ii) a bar magnet. List two distinguishing features.
A) A solenoid is a coil of wire. (i) Uniform magnetic field, (ii) Two poles
B) A solenoid is a permanent magnet. (i) Non-uniform magnetic field, (ii) One pole
C) A solenoid is a type of battery. (i) Alternating magnetic field, (ii) No poles
D) A solenoid is a type of resistor. (i) Varying magnetic field, (ii) Three poles
