Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 22

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Question 1
1 / -0

Why is parallel arrangement used in domestic wiring?

A
For getting same potential difference across each electrical appliance.

B
For getting different potential difference across each electrical appliance.

C
For getting high potential difference across each electrical appliance.

D
For getting low potential difference across each electrical appliance.
Solution
The usage of parallel arrangement in domestic circuits has many advantages.
- Each circuit will have the same potential difference which is equal to the potential difference of the supply line. As a result, each electrical appliance will work under constant voltage.
- When two or more appliances are used at the same time, each appliance will be able to draw the current as needed. The appliances having low resistance will draw higher current and vice versa.
- When distribution circuits are in parallel, then each circuit operates separately. So, if one of the distribution circuits gets overloaded, only the fuse in that circuit will be blown off. The other distribution circuits will remain unaffected.
Question 2
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A magnetic field is produced by the current passing through a long straight wire. When will the strength of the magnetic field increase?

A
When the magnitude of the current increases

B
When the distance from the wire increases

C
Both $$A$$ and$$B$$

D
None of these

Solution

A metallic wire carrying an electric current has associated with it a magnetic field. The magnitude of the magnetic field produced at a given point increases as the current through the wire increases. The magnetic field produced by a given current in the conductor decreases as the distance from it increases.
Question 3
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Analyze the given statements and choose the correct option.

Statement 1 : When the current is represented by a straight line, the magnetic field lines will be circular.

Statement 2 : According to Fleming's left-hand rule, the direction of the force is parallel to the magnetic field.

A
Both statement 1 and statement 2 are CORRECT and statement 2 is the CORRECTexplanation of the statement 1.

B
Both statement 1 and statement 2 are CORRECT, but statement 2 is NOT THE CORRECT explanation of the statement 1.

C
Statement 1 is CORRECT, but statement 2 is INCORRECT.

D
Statement 1 is INCORRECT, but statement 2 is CORRECT.

Solution

The magnetic field lines due to a current-carrying straight wire are circular in nature with the wire at the center.
According to Fleming's left-hand rule, the direction of force is perpendicular to the magnetic field.
Question 4
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How will crowding the wires of a solenoid, more closely together, will affect the strength of the field inside it?

A
Field strength increases

B
Field strength decreases

C
Can't be said

D
Field strength will remain unchanged

Solution

Crowding the wires of a solenoid more closely together will increase the strength of the field inside it since the strength of the field inside the magnetic field is proportional to the number of turn of the wire on the solenoid.
Question 5
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Complete the following statements with an appropriate word / term to be filled in the blank space(s).
You are looking into a solenoid, at its S-pole, along its axis. From your view point, the direction of the current in the solenoid is _______:

A
clockwise

B
anti-clockwise

C
parallel to axis

D
perpendicular to axis

Solution

You are looking into a solenoid, at its S-pole, along its axis. From your view point, the direction of the current in the solenoid is clockwise.
The pole of the solenoid can be easily determined by the adjacent figure.
Question 6
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Two compass needles are placed near a current carrying wire at points P and Q as shown in the figure. What can be concluded?

A
Their needles will not deflect.

B
Needle at P only will deflect

C
Both the needles will deflect in the same direction.

D
The needles will deflect in opposite directions

Solution

Magnetic field due to wire is circular with wire passing through the center of circle. In above fig field line will be coming out of page at point P and going into the page at point Q So needle at P will point toward you (i.e. out of page) and at Q it will point into the page. Therefore (d) is the correct option.
Question 7
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Complete the following statements with an appropriate word / term to be filled in the blank space(s).

You are looking along the axis of a solenoid, and the current from your position is clockwise. The end of the solenoid facing you is a _____ pole.

A
South

B
North

C
North and south both

D
None of these

Solution

You are looking along the axis of a solenoid, and the current from your position is clockwise. The end of the solenoid facing you is a south pole.
The usual convention is shows in the figure.
Question 8
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If the index finger points towards the north and the middle finger towards the east, when using Flemings left-hand rule, what will be the direction of motion or that of the force acting on the conductor?

A
South

B
West

C
Top

D
Bottom

Solution

Flemings left-hand rule is used to determine direction of force on a current carrying conductor in magnetic field. According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of the current, then the thumb will point in the direction of motion or the force acting on the conductor.
So according to given situation in figure when index finger points to field in north and middle finger points to current in east then the thumb will give direction of force (direction of motion) which is upwards
Question 9
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The frequency of A.C mains in India is

A
$$30 Hz$$

B
$$50Hz$$

C
$$60Hz$$

D
$$120Hz$$

Solution

In India, the AC mains supply is referred to as single-phase alternating current and corresponds to a voltage of 230 V at a frequency of $$50 Hz$$, similar to most European countries. Whereas in the USA, AC mains supply uses $$60 Hz$$
Question 10
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When a conductor carrying an electric current is free to move in a magnetic field, the direction in which it will move is given by:

A
Cork-screw rule

B
Fleming's Left Hand rule

C
Laplace's rule

D
Swimming rule
Solution
When current flows in a wire, and an external magnetic field is applied across that flow, the wire experiences a force perpendicular, to that field and to the direction of the current flow. Considering the figure, Fleming's left hand rule states that :
- The thumb represents the direction of the thrust on the conductor / Motion of the Conductor.
- The fore finger represents the direction of the magnetic field
- The middle finger represents the direction of the current.