Relative Strength of Magnetic Field

Q.

Define magnetic lines of force. By drawing a neat diagram show magnetic field around bar magnet.

Q. A force of 10N is required to move a conducting loop through a non uniform magnetic field at 2m/s. the rate of production of electrical energy in loop is?

Q. A small electric dipole is placed in x-y plane at origin with its dipole moment directed along positive x-axis. The direction of electric field at point (2, 2/2, 0) is

Q. What does crowding of magnetic field lines indicate ?

1. Crowding of magnetic field lines indicates that magnetic field in that region is strong
2. None of these
3. Crowding of magnetic feild lines does not refelct any things
4. Crowding of magnetic field lines indicates that magnetic field in that region is poor

Q. What is the importance in saying that magnetic field lines runs from north to south pole?

why did we even consider the emergence of the field line from one of the poles? What is the reason we did not consider the generation of those lines with help of both the poles?

Q. the mid points of two small magnetic dipoles of length d in end on positions are seperated by a distance x (x >> d) . the force between them is proportional to x^-n where n is?

Q. Magnetic field lines do not form closed loops.

1. False
2. True

Q.

How do you measure the relative strength of magnetic fields generated by two current carrying coil?

1. Calculate the density of iron filings at the edges

2. Calculate the size of the magnetic field produced

3. Use a multimeter to calculate the current flowing through the coil

4. Use a voltmeter to find the current flowing through the coil

Q.

Where is a magnetic field strongest?

Q.

Ram has one bar in each hand of his. It is known to him that one of them is a magnet and the other is a magnetic material but not which bar is the magnet or which one is the magnetic material. He brings together the ends of both bars. He feels that there is an attractive force between them. Now he repeats the experiment, but this time, he brings together the end of the bar in his left hand and the centre of the bar in his right hand. He experiences an attractive force but one which is weaker than the earlier force. What could be the correct answer?

1. Both bars must be magnets

2. Need more information

3. Bar B is magnet, Bar A is magnetic material

4. Bar A is magnet, Bar B is magnetic material

Q.

Lines that represent the attractive force around the magnet are called _________.

Q.

List the properties of magnetic lines of force.

Q. The angle between the electric dipole moment and the electric field strength due to it, on the equatorial line is

Q. Two small bar magnets are placed at a line of certain dus†an ce d apart.if the length of each magnets are neglegible compared to d the force between them will be inversly proportional to a) d2 b) d c) d3 d) d

Q. (a) A circular coll of 30 turns and radius 8.0 cm carrying a currentof 6.0 A is suspended vertically in a uniform horizontal magneticfleld of magnitude 1.0 T. The field lines make an angle of 60^° with the normal of the coil.calculate the magnitude of the counter torque that must be applied to prevent the coil from turnin

Q. Question 1
Choose the incorrect statement from the following regarding magnetic lines of field.

(a) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points
(b) Magnetic field lines are closed curves
(c) If magnetic field lines are parallel and equidistant, they represent zero field strength
(d) Relative strength of magnetic field is shown by the degree of closeness of the field lines​​​​​​​

Q.

Ram has one bar in each hand of his. It is known by him that one of them is a magnet and the other is a magnetic material but not which bar is the magnet or which one is the magnetic material. He brings together the ends of both bars. He feels that there is an attractive force between them. Now he repeats the experiment, but this time he brings together the end of the bar in his left hand and the centre of the bar in his right hand. He experiences an attractive force but one which is weaker than the earlier force.

What could be the correct answer?

1. Bar B is magnet , Bar A is magnetic material

2. Bar A is magnet , Bar B is magnetic material

3. Both bars must be magnets

4. Need more information

Q. When magnetic field lines are close, the magnetic field is:

1. Weak
2. Random
3. Non existent
4. Strong

Q.

As shown in the diagram, there is a magnetic field within a region of space. The magnetic field strength is the greatest at

1. S

2. Q

3. R

4. P

Q. why can't we show north and south to a point formed by the intersection of two magnetic field lines? [we know that 2 magnetic lines of force cannot intersect each other]

Q.

Why does a magnetic power come from a string always come to rest in north south direction

Q. The magnetic field strength at $1,2,$ and $3$ in the following picture is in the order:

1. $1=2=3$
2. $1>3>2$
3. $1>2>3$
4. $3>2>1$

Q. Magnetic field lines do not form closed loops.

1. False
2. True

Q. The presence of magnetic field at a point can be detected by

1. ammeter
2. galvanometer
3. a compass needle
4. strong magnet

Q.

When a magnet is kept on a table and a compass is taken close to it, it points in a certain direction at every point near the magnet. When the points are joined, we obtain certain lines. Choose the correct statement(s) regarding the lines
1. The closer they are, the stronger the magnet.
2. They are imaginary lines which have a particular direction.

1. Both 1 and 2

2. Neither 1 nor 2

3. Only 2

4. Only 1

Q.

in a bar magnet is there a line or a plane separating North and South sides of a magnet

Q. Magnetic field lines do not form closed loops.

1. False
2. True

Q. Option 25
Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current carrying loop is brought near it. Describe some salient features of magnetic lines of field concept.

Q.

The strength of magnetic field inside a long current carrying solenoid is :

1. same at all points.

2. found to increase from one end to the other.

3. found to be maximum at the centre.

4. minimum in the middle.

Q.

What are magnetic lines of force?