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Physics
11th
grade
Aromatic - 12th-Magnetic Field- Biot Savart law- Ampere law
26 questions
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- 1. Multiple Choice
The magnetic field lines near a long straight wire carrying current are:
Straight lines
Concentric rings
Spiral lines
Radial lines
- 2. Multiple Choice
According to right hand thumb rule the direction of magnetic field in a current carrying straight conductor is denoted by:
Thumb
Curl fingers
Middle finger
First finger
- 3. Multiple Choice
According to right hand thumb rule the direction of magnetic field in a current carrying circular coil is denoted by
Thumb
Middle finger
Curl finger
First finger
- 4. Multiple Choice
Refer the diagram. The right face of the loop acts as North pole and left side of loop acts as south pole
False
True
- 5. Multiple Choice
Calculate the magnetic field due to a straight conductor of infinite length carrying a current of 3 A at a point 5 cm away from the center of conductor?
0.6 x 10-5 T
1.2 X 10-5 T
3 X 10-5 T
12 X 10-5 T
- 6. Multiple Choice
The magnetic field at the center O' of the following current loop is
- 7. Multiple Choice
The strength of the magnetic field at a point x near a long straight current carrying conductor is B. The field at a distance x/2 will be -----------
B/2
B/4
2 B
4 B
- 8. Multiple Choice
Magnetic field arises due to
flow of steady current through a current element
flow of charges
flow of steady current through an infinite wire
flow of steady current through a closed loop
- 9. Multiple Choice
Biot Savart law states
Magnetic field has a net outward flow
Magnetic field has no net outward flow
Magnetic field and electric field are normal to each other
Total magnetic flux coming out of a surface is total current enclosed
- 10. Multiple Choice
Amper's law states that
total current enclosed by a current carrying loop is zero
total magnetic field over a closed loop is equal to current carrying loop is permiability * current
total electric field over a closed loop is equal to current carrying loop is permiability * current
total current over a closed loop is equal to magnetic field enclosed by loop * permiability
- 11. Multiple Choice
A wire has current travelling to the right. What is the direction of the magnetic field above the wire?
Up
Down
Into page
Out of page
- 12. Multiple Choice
What is the unit of magnetic field?
ampere
watt
kilowatt hour
tesla
- 13. Multiple Choice
Moving charges, or an electric current, produces a magnetic field.
Gauss's Law
Ohm's Law
Ampere's Law
Law of Conservation of Magnetism
- 14. Multiple Choice
1) A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:
A. Directed to the right
A. Directed to the left
A. Equal to the magnetic field
In the same direction as the magnetic field
- 15. Multiple Choice
1) A solenoid with 500 turns, 0.10 m long, carrying a current of 4.0 A and with a radius of 102 m will have what strength magnetic field at its center?
31 x 10 – 4 T
62 x 10 – 4 T
125 x 10 – 4 T
250 x 10 – 4 T
- 16. Multiple Choice
Solenoid #1 has a length L, cross-sectional area A, and N turns. Solenoid #2 has a length 2L, cross-sectional area 2A, and 2N turns. Which solenoid has the greater magnetic field at its center when equal currents are going through them?
#1
#2
Both have the same magnetic field.
Since it depends on the values of A and L, none of the above are correct
- 17. Multiple Choice
1) In the figure, using the right hand rule around a solenoid, which of the below statements is correct:
North Pole is 7 and South pole is 8
North Pole is 8 and South Pole is 7
There is no magnet, so no north or south
The current is flowing in the direction from 7 to 8
- 18. Multiple Choice
1) Two long parallel wires 40 cm apart are carrying currents of 10 A and 20 A in the opposite direction. What is the magnitude of the magnetic field halfway between the wires?
1.0 x 10^-5 T
2.0 x 10^-5 T
3.0 x 10^-5 T
4.0 x 10^-5 T
- 19. Multiple Choice
1) A superconducting wire carries a current of 10^4 A. Find the magnetic field at a distance of 1.0 m from the wire.
2 x 10^-3 T
8 x 10^-3 T
1.6 x 10^-2 T
3.2 x 10^-2 T
- 20. Multiple Choice
1) A superconducting solenoid is to be designed to generate a magnetic field of 5.00 T. If the solenoid winding has 1000 turns/m, what is the required current?
1000 A
1990 A
3980 A
5000 A
- 21. Multiple Choice
1) A straight wire carries a current inside the paper. What is the direction of the magnetic field at point P?
Points to the right
Points to the left
Points to the top of the page
Points to the bottom of the page
- 22. Multiple Choice
1) A bar magnet is at rest, next to a fixed electromagnet. In which direction will the bar magnet move when switch S is closed?
to the left
to the right
up the page
down the page
- 23. Multiple Choice
1) A 3.25 A current is moving through a loop with 5 turns. What is the radius of the loop that produces a magnetic field of 3.4 x 10^-4 T at its center?
0.03 m
0.25 m
0.50 m
0.75 m
- 24. Multiple Choice
1) What is the magnitude of the magnetic field at the core of a 120-turn solenoid of length 0.50 m carrying a current of 2.0 A?
2.4 × 10– 4 T
4.8 × 10– 5 T
1.2 × 10– 6 T
6.0 × 10– 4 T
- 25. Multiple Choice
1) Two long, parallel wires each carry the same current I in the same direction. Is the total magnetic field at the point midway between the wires:
Zero
Directed into the page
Directed out of the page
Directed to the left
- 26. Multiple Choice
1) A wire carries current I directed to the right as shown in the figure below. What is the direction of the magnetic field generated by the wire at point A?
To the right
To the left
Toward the wire
Into the page
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