Advertisements
Advertisements
Question
In the simple electric motor of figure given below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil
Is the current flowing clockwise or anticlockwise around the coil when viewed from above?
Advertisements
Solution
The current is flowing in clockwise direction around the coil when viewed from above.
Using Fleming's left-hand rule, the direction of current can be found.
APPEARS IN
RELATED QUESTIONS
The magnetic field in a given region is uniform. Draw a diagram to represent it.
Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer.)
A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is ______.
Which of the following correctly describes the magnetic field near a long straight wire?
What concealed do you get from the observation that a current-carrying wire deflects a compass needle placed near it?
State qualitatively the effect of inserting an iron core into a current-carrying solenoid.
Name the rule for finding the direction of magnetic field produced by a straight current-carrying conductor.
State the form of magnetic field lines around a straight current-carrying conductor.
State whether the following statement is true or false:
The magnetic field inside a long circular coil carrying current well be parallel straight lines.
Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor.
What are the various ways in which the strength of magnetic field produced by a current-carrying circular coil can be increased?
Name the type of magnet with which the magnetic field pattern of a current-carrying solenoid resembles
What type of core should be put inside a current-carrying solenoid to make an electromagnet?
A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:
(a) will decrease
(b) will increase
(c) will become zero
(d) will remain the same
Which way does the wire in the diagram below tend to move?
A flat coil ABCD is freely suspended between the pole of U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
What happens when a current is passed in the coil?
A coil ABCD mounted on an axle is placed between the poles N and S of a permanent magnet as shown in Figure.
- In which direction will the coil begin to rotate when current is passed through the coil in direction ABCD by connecting a battery at the ends A and D of the coil?
- Why is a commutator necessary for continuous rotation of the coil?
- Complete the diagram with commutator, etc. for the flow of current in the coil?
State two ways to increase the speed of rotation of a D.C. motor.
Write Fleming’s left hand rule.
