Question

UNIT 12 ELECTROMACNET 104 2. The direction of conductor flux is dependent on a current magnitude. b current direction. c the compass needle. d the magnitude of voltage applied. e. the core material. 3. The magnetic polarity of a coil is determined by a the magnitude of voltage applied. b. the current magnitude. c. the magnetic strength. d. the number of turns. e. the direction of current. The magnetic strength of a coil depends on a. current direction. b. the left-hand rule. 4. c. flux direction. d. current magnitude. e. the point where the field emerges. 5. A 20-turn coil, with an air core, carries a current of 2 amperes. The magnetic strength of the coil can be increased by a. making the turns larger. b. inserting an iron core. c. decreasing the current. d. slightly decreasing the voltage drop across the coil. e. reversing the current direction. 6. When iron filings are attracted to a current-carrying conductor, this indicates a. a magnetic field direction. b. aN pole. c. the presence of a magnetic field d the strength of a magnetic field. e the magnitude of current.

Answer 1

The direction et conducto flux will depends on b. current direction | Explenation :- By right hand thumb rue flux sets up around a conductor bared on the direction as current slowing through it. I ③ polority of a coil in The magnetic determined by le the direction of the current Emplenation", - By dot convention rule current entering at a coil will takes a dot (-) which meam magnetic polarity will cane it the direction d current is canged. Žem The magnetic strength of a coil depend on d. magnitude of current - - met 9 do current magnitude Explenetion H = NI When Hin bield the reneth depend on noist tums (N) maquetude of corrent (2)

manetic field strength H in given by le H depends on no. of turm N current magnitude I length of the coil l. in mainetic field storength of the coil can be increased by a) making the turn larger | h when current iron -Fillings are carrying conductor, attracted to a this indicate Tc. The presence of a magnetic field !