Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 30

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Question 1
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Inside the magnet, the direction of field lines is from

A
north to south pole

B
south to north pole

C
depends on position on the earth

D
none

Solution

The direction of the magnetic field is taken to be the direction in which a north pole of the compass needle moves inside it. Therefore it is taken by convention that the field lines emerge from north pole and merge at the south pole. Inside the magnet, the direction of field lines is from its south pole to its north pole. Thus the magnetic field lines are closed curves. The relative strength of the magnetic field is shown by the degree of closeness of the field lines. The field is stronger, that is, the force acting on the pole of another magnet placed is greater where the field lines are crowded. No two field-lines are found to cross each other. If they did, it would mean that at the point of intersection, the compass needle would point towards two directions, which is not possible.
Question 2
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Directions For Questions

In above shown figure, the wire of circuit X passes between the poles of a permanent magnet and at one point the wires of circuits are parallel. Arrow A points up out of the plane of the paper. Arrow E follows a circle that comes out of the paper on the left side of the wire and goes back into the paper on the right side of the wire.

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Find out the arrow or arrows which give the direction of conventional current flow.

A
Arrow A only

B
Arrow B only

C
Arrow C only

D
Arrows A and D

E
Arrows B and E

Solution

Arrow $$A$$ shows , the direction of magnetic force experienced by a current carrying wire in a perpendicular magnetic field and it is given by Fleming's left hand rule .
Arrow $$B$$ shows,the direction of magnetic field ,from north pole to south pole.
Arrow $$C$$ shows, the direction of conventional current from positive terminal to negative terminal of the battery.
Arrow $$D$$ shows, the direction of repulsion force exerted by wire in circuit $$X$$ to the wire of $$Y$$ due to fact that direction of current in both parallel wires is opposite.
Arrows $$E$$ shows ,the direction of magnetic field lines due to current carrying wire of circuit $$X$$ which is given by right hand thumb rule.
Question 3
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Choose the correct option which describe the magnetic field produced by a current in a long, straight wire?

A
The field lines are radially inward to the wire

B
The field increases in strength as the distance from the wire increases.

C
The field lines are directed parallel to the wire, but opposite to the direction of the current

D
The field lines are directed radially outward from the wire

E
The field lines are concentric circles with the wire passing through the center

Solution

The figure shows the nature of magnetic field lines due to a long, straight current-carrying wire.
It is evident that the field lines are concentric circles with the wire at the center.
Question 4
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A positive charge is at rest in a uniform magnetic field directed to the right. What force does the positive charge feel, due to the magnetic field?

A
An upward force.

B
A downward force.

C
A force to the left.

D
No force is felt.

Solution

For experiencing a magnetic force on a charge particle, the particle should move in the magnetic field with some velocity. As the velocity of the particle is zero so, the force on the particle is also zero.
Question 5
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The diagram below shows a wire carrying current towards the top off the page. A positively charged particle is shown moving directly toward the left side of the page at a particular instant.
What is the direction of the force on the positively charged particle at the instant shown, due to the magnetic field produced by the current in the wire?

A
towards the top of the page

B
towards the bottom of the page

C
into the page

D
out of the page

E
towards the right side of the page

Solution

The direction of magnetic field lines in the region left to the current carrying wire where the positive charge is moving will be perpendicularly inward the page according to the right thumb rule .
The direction of movement of positive charge can be taken the direction of current . As the positive charge is moving toward left therefore it will be the direction of current , and magnetic field is perpendicular inward the paper so according to Fleming's left hand rule , force on positive charge will be toward the bottom of the page .
Question 6
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Below a negatively charged particle is pictured moving north east through a magnetic field that points straight up. What is the direction of the force on the negatively charged particle at the moment it is pictured?

A
northeast

B
southeast

C
southwest

D
northwest

E
up

Solution

When we put our hand in such a way that index finger upward direction, middle finger is in south-west direction then our thumb is directed in north-west direction. Hence the direction of the force is in northwest direction.
Question 7
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A wire placed within a magnetic field has a current flowing in it as shown in the above figure. Identify the direction of the force exerted by the magnetic field on the wire.

A
Point $$A$$

B
Point $$B$$

C
Point $$C$$

D
Point $$D$$

E
No forces are exerted on the wire

Solution

The direction of magnetic force in a current-carrying wire in a magnetic field can be obtained by Fleming's left-hand rule. if we apply Fleming's left-hand rule in this wire the direction of the force will be in the vertically downward direction perpendicular to the magnetic field and the direction of the current.

Here, the forefinger of the left hand is pointed towards the right. The middle finger is pointed along the direction of the current. So, the thumb, indicating the direction of force, is pointed towards the point $$C$$.
Question 8
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The diagram below shows a positively charged particle moving toward the right and about to enter a magnetic field whose direction is shown by the blue arrows. What is the direction of the force on the positively charged particle (from our point of view) at the instant it enters the magnetic field?

A
right

B
left

C
up

D
toward us

E
away from us

Solution

Index finger represent the magnetic field which is downwards and the charge particle moving in right direction hence the current moving in left direction. Now we can predict the direction of the force by applying Fleming left hand rule which is away from us.
Question 9
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In above shown figure, the direction of magnetic force and magnetic field is given then find out the direction of the particle velocity, v.

A
To the right

B
Downward, in the plane of the page

C
Upward, in the plane of the page

D
Out of the plane of the page

E
Into the plane of the page

Solution

In the figure the direction of the magnetic field and force are given. Now if we apply Fleming left hand rule the direction of the particle velocity will be into the plane of the page.
Question 10
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An electron enters with a velocity $$v$$ to the right in a magnetic field $$B$$, also to the right. What direction is the force $$F$$ on the electron?

A
An upward force

B
A downward force

C
A force to the left

D
No force if felt

Solution

According to the Fleming left hand rule, all the force, magnetic field and the velocity of the particle are mutually perpendicular to each other. As the field and the field are in the same plane so the particle will be not experiencing any force.