4. State Ampere‟s circuital law. (AUG 21, MAR 23, JUN 23,24, SEP 20)
5. Define ampere (or) Define Ampere of force. (JULY 22)
6. State Fleming's left hand rule. (JUNE 23)
7. Define current sensitivity. How will increase current sensitivity of
a galvanometer. (MAY 22, MAR 24)
8. Is an ammeter connected in series or parallel in a circuit? Why?
9. What is meant by hysteresis? (MAR 24)
10. Write the limitations of Cyclotron. (MAR 25)
11. Two materials X and Y are magnetised whose values of intensity of
magnetisation are 500𝐴𝑚−1 and 2000𝐴𝑚−1 respectively. If the magnetizing
field is 1000 𝐴𝑚 −1. What is the ratio between the susceptibilities of
the two materials? (OR) which one among these materials can be easily
magnetized? (Example 3.10) (MAR 20)
12th Physics Chapter 3 Important - 3 Marks
1. State Biot -Savart‟s law.
2. Compare a dia, para and ferro -magnetism.
3. Give the properties of dia /para/ ferro magnetic materials.
4. Discuss the conversion of galvanometer into an ammeter. (MAR 23)
5. Discuss the conversion of galvanometer into a voltmeter. (MAR 20)
6. Give an account of magnetic Lorentz force. (MAY 22,MAR25)
7. Compare the properties of soft and hard ferromagnetic materials.
8. A coil of a tangent galvanometer of diameter 0.24 m has 100 turns. If
the horizontal component of Earth‟s magnetic field is 25×10-6 T then,
calculate the current which gives a deflection of 600 . (Exam 3.14)
(JUNE 23)
9. An electron moving perpendicular to a uniform magnetic field 0.500 T
undergoes circular motion of radius 2.50 mm. What is the speed of
electron? (Exam 3.19) (JULY 22)
10. The repulsive force between two magnetic poles in air is 9×10−3 𝑁.
If the two poles are equal in strength and are separated by a distance
of 10 𝑐𝑚, calculate the pole strength of each pole. (Exam- 3.5)(AUG 21)
12th Physics Chapter 3 Important - 5 Marks
1. Deduce there infinitely long straight conductor carrying current
using Biot-Savart law. (AUG 21, MAY 22, JUNE 24)
2. Obtain a relation for the magnetic field at a point along the axis of
a circular coil carrying current using Biot-Savart law. (MAR 24)
3. Calculate the magnetic field at a point on the axial line of a bar
magnet.
4. Obtain the magnetic field at a point on the equatorial line of a bar
magnet.
5. Find the magnetic field due to a long straight conductor using
Ampere‟s circuital law. (SEP 20, JUN 23)
6. Discuss the working of cyclotron in detail. (MAR 23)
7. Derive the expression for the force between two parallel,
current-carrying conductors. (MAR 20)
8. Derive the expression for the force on a current-carrying conductor
in a magnetic field. (JULY 22)
9. Derive the expression for the torque on a current-carrying coil in a
magnetic field. (MAR 25)
10. Explain the principle and working of a moving coil galvanometer.
வாசகர்களின் கருத்துக்களை அன்புடன் வரவேற்கின்றோம்.