Magnetic Effects of Electric Current Test

Result

Magnetic Effects of Electric Current Test - 35

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The phenomena of a electromagnetic induction is

A
The process of charging a body

B
The process of generating magnetic field due to current passing through a coil

C
Producing induced current in a coil due to relative motion between a magnet and a coil

D
All the above
Question 2
1 / -0

Fleming's left hand rule is used to find

A
Direction of magnetic field

B
Direction of current

C
Direction of magnetic force acting on conductor

D
None of these

Solution

When a current carrying conductor is placed in a magnetic field, it experiences a magnetic force. The direction of that force can be easily found using Fleming's left hand rule.
According to this rule, if the forefinger of the left hand points the direction of the magnetic field, the middle-finger points the direction of current in the conductor then the thumb will point the direction of the force acting on the conductor.
Question 3
1 / -0

A current is flowing in electricity line towards north, the direction of magnetic field at a point which is just below the line is :

A
towards north

B
towards south

C
towards east

D
towards west

Solution

Apply thumb rule
According to place you palm on current-carrying conductor and surrounds the conductor with your fingers and your thumb should be in the direction of current flowing
Now at any point, magnetic field lines direction will be same as direction of your fingertips.
So option D
Question 4
1 / -0

A magnetic field lines due to a straight wire carrying a current are

A
Straight

B
Circular

C
Parabolic

D
Elliptical

Solution

Figure (a) and (b): The diagrams show the magnetic field pattern around a straight conductor carrying current.
The Magnetic field lines around a straight conductor carrying current are concentric circles whose centres lie on the wire. The direction of magnetic field lines can be determined using Right-Hand Thumb Rule.
Question 5
1 / -0

The magnetic field lines in the middle of the solenoid are :

A
circles

B
parallel to the axis

C
spirals

D
perpendicular to the axis

Solution
Question 6
1 / -0

The diagram shows a coil of wire connected to a voltmeter. A student has a magnet and an unmagnetised iron rod. How can an e.m.f. be induced across the coil?

A
Holding the magnet inside the coil

B
Holding the iron rod inside the coil

C
Pushing the magnet into the coil

D
Pushing the iron rod into the coil

Solution

As the magnet is pushed into the coil, more magnetic flux will pass through the coil. Therefore, it causes a change in magnetic flux linked with the coil. This changing magnetic flux will induce an emf across the coil.
Question 7
1 / -0

Which diagram shows the magnetic field around a bar magnet?

A

B

C

D
Solution
- Two magnetic field lines never interest each other.
- Outside the magnet, the magnetic field lines are directed from North pole of the magnet towards the South pole.
- The magnetic field lines at any one point give the direction of magnetic field at that point
Question 8
1 / -0

According to Fleming's left-hand rule, whose direction is indicated by thumb?

A
Electric current

B
Magnetic force

C
Magnetic field

D
None of these

Solution

According to Fleming's left-hand rule, if we stretch the thumb, forefinger, and the middle finger of the left-hand perpendicular to each other, then the forefinger indicates the direction of the magnetic field, the middle finger denotes the direction of current and the thumb represents the direction of the force.
Question 9
1 / -0

Electromagnetic induction means ......... .

A
charging of an electric conductor.

B
production of magnetic field due to a current flowing through a coil.

C
generation of a current in a coil due to relative motion between the coil and the magnet.

D
motion of the coil around the axle in an electric motor.

Solution

The process of producing induced current in a closed circuit or in a coil by changing the magnetic field (i.e. relative motion between the coil and magnet) linked with the coil is known as electromagnetic induction. ... This process of producing induction current is known as electromagnetic induction.
Question 10
1 / -0

Which of the following correctly shows the magnetic field produced by an electric current in a long straight wire?

A

B

C

D

Solution

In the magnetic field produced by an electric current in a long straight wire, the magnetic field lines are co-centric circles. So, option A and B are consistant with this but the direction of the line is also a factor here.
IT is determined by Maxwell's right hand thumb rule, which suggests, if I am holding the wire in my right hand such that the thumb points towards the direction of current, then my fingers will wrap around the wire in the direction of field lines.
So, in the case of the given problem the direction of the field line will be anti-clockwise as that of option (B).
So, option (B) is correct.