Advertisements
Advertisements
Question
How does a magnetic field set up by a solenoid change when a soft iron core is inserted inside solenoid?
Advertisements
Solution
By placing a soft iron core inside the solenoid, the magnetic field becomes more intense.
RELATED QUESTIONS
The diagram shows a coil wound around a U shape soft iron bar AB.
1) What is the polarity induced at the ends A and B when the switch is pressed?
2) Suggest one way to strengthen the magnetic field in the electromagnet
3) What will be the polarities at A & B if the direction of current is reversed in the circuit?
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
principle of an electric motor ?
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
The magnetic flux through a coil having 100 turns decreases from 5 milli weber to zero in 5 second. Calculate the e.m.f. induced in the coil.
How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
State three factors which govern the speed of rotation of an electric motor.
What is dynomo (a.c. generator)? State the principle on which it works.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
State the function of a split ring in D.C. motor.
