5.3 Self Induction

Self induction is the process of

• producing an induced e.m.f. in the coil due to a change of current flowing through the same coil

• producing an induced e.m.f. in the coil due to the change of current flowing through another coil

Which of the following statement is CORRECT when current in the coil is increasing?

• both magnetic field and magnetic flux will be increasing

• magnetic field will be increasing

• magnetic flux will be decreasing

• both magnetic field and magnetic flux will be decreasing

When the currrent in the coil is increasing, the induced current produced will be in _______________ to oppose the ________________.

• opposite direction ; increasing magnetic flux

• opposite direction ; decreasing magnetic flux

• same direction ; increasing magnetic flux

• same direction ; decreasing magnetic flux

Which of the following statement is CORRECT when current in the coil is decreasing?

• both magnetic field and magnetic flux will be increasing

• magnetic field will be increasing

• magnetic flux will be decreasing

• both magnetic field and magnetic flux will be decreasing

When the currrent in the coil is decreasing, the induced current produced will be in _______________ to oppose the ________________.

• opposite direction ; increasing magnetic flux

• opposite direction ; decreasing magnetic flux

• same direction ; increasing magnetic flux

• same direction ; decreasing magnetic flux

L, is the symbol for self inductance which is the ratio of..

• induced e.m.f. to the rate of change of current in the coil

• the rate of change of current in the coil to induced e.m.f.

Which equation is INCORRECT to determine self inductance?

The unit for self inductance, L is...

• Weber

• Henry

• Tesla

• Joule

Figure shows the current flowing through the solenoid. By using Len'z law, determine the direction of induced current if the resistance in the circuit is increasing.

• same direction as initial current , to increase the magnetic flux that decreasing

• opposite direction as initial current , to increase the magnetic flux that decreasing

• same direction as initial current , to decrease the magnetic flux that increasing

• opposite direction as initial current , to decrease the magnetic flux that increasing

Figure shows the current flowing through the solenoid. By using Len'z law, determine the direction of induced current if the resistance in the circuit is decreasing.

• same direction as initial current , to increase the magnetic flux that decreasing

• opposite direction as initial current , to increase the magnetic flux that decreasing

• same direction as initial current , to decrease the magnetic flux that increasing

• opposite direction as initial current , to decrease the magnetic flux that increasing