Magnetic Effects Of Electric Current
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Time: 30 Minute
- 1.The magnetic field lines produced by a bar magnet:
- A.
Originate from the South pole and end at its North Pole
- B.
Originate from the North pole and end at its East Pole
- C.
Originate from the North Pole and end at its South Pole
- D.
Originate from the South pole and end at its West Pole
- 2.The north pole of Earth’s magnet is in the:
- A.
Geographical South
- B.
Geographical East
- C.
Geographical West
- D.
Geographical North
- 3.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
- 4.A current carrying conductor is held in exactly vertical direction. Inorder to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:
- A.
From top towards bottom
- B.
From left towards right
- C.
From bottom towards top
- D.
From right towards left
- 5.The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is:
- A.
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- B.
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- C.
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- D.
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- 6.
- A.
The speed with which the magnet is moved
- B.
The number of turns of the coil
- C.
The resistivity of the wire of the coil
- D.
The strength of the magnet
- 7.A car headlamp of 48 W works on the car battery of 12 V. The correct fuse for the circuit of this car headlamp will be:
- A.
3 A
- B.
5 A
- C.
10 A
- D.
13 A
- 8.
![A constant current flows in a horizontal wire in the plane of the paper from east to west as shown below, the direction of magnetic field at a point will be north to south:]( "A constant current flows in a horizontal wire in the plane of the paper from east to west as shown below, the direction of magnetic field at a point will be north to south:")
A constant current flows in a horizontal wire in the plane of the paper from east to west as shown below, the direction of magnetic field at a point will be north to south:- A.
Directly above the wire
- B.
Directly below the wire
- C.
At a point located in the plane of the paper, on the north side of the wire
- D.
At a point located in the plane of the paper, on the south side of the wire
- 9.If two circular coils can be arrange in any of the tree situations shown in the diagram below, then their mutual induction will be:
- A.
Maximum in situation (a)
- B.
Maximum in situation (b)
- C.
Maximum in situation (c)
- D.
The same in all situations
- 10.
- A.
A only
- B.
A and B only
- C.
B and C only
- D.
A, B and C
- 11.
![An electric current passes through a straight wire in the direction of south to north. Magnetic compasses are placed at points A and B as shown in the figure. What is your observation?]( "An electric current passes through a straight wire in the direction of south to north. Magnetic compasses are placed at points A and B as shown in the figure. What is your observation?")
- A.
The needle will not deflect
- B.
Only one of the needles will deflect
- C.
Both the needles will deflect in the same direction
- D.
The needles will deflect in the opposite directions
- 12.A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside the solenoid:
- A.
Will become zero
- B.
Will decrease
- C.
Will increase
- D.
Will remain unaffected
- 13.
- A.
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- B.
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- C.
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- D.
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- 14.
- A.
A fuse should be fitted in a live wire
- B.
A 13 A fuse is the most appropriate value to use
- C.
The neutral wire is coloured black
- D.
The green wire should be connected to the earth pin
- 15.A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in the figure below: The force on the wire due to the magnet is directed:
- A.
From N to S
- B.
From S to N
- C.
Vertically downwards
- D.
Vertically upwards
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