MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the torque on a 500 turn rectangular coil of length 20 cm and breadth 10 cm, carrying a current of 30 A, when placed making an angle of 60o with a magnetic field of 0.5 T? |
| A. | 625 Nm |
| B. | 125 Nm |
| C. | 75 Nm |
| D. | 25 Nm |
| Answer» D. 25 Nm | |
| 2. |
Under which of these conditions, the torque acting on the current-carrying loop is minimum? |
| A. | θ = 90o |
| B. | θ = 0o |
| C. | θ = 180o |
| D. | θ = 360o |
| Answer» B. θ = 0o | |
| 3. |
‘X’ is the product of the pole strength of either magnetic pole and the magnetic length of the magnetic dipole. Identify X. |
| A. | Magnetic dipole |
| B. | Magnetic dipole moment |
| C. | Magnetic pole strength |
| D. | Magnetic dipole length |
| Answer» C. Magnetic pole strength | |
| 4. |
The factor \((\frac {eh}{4\pi m_e})\) is the least value of the magnetic moment. This natural unit of magnetic moment is called Planck’s constant. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
Give the SI unit of magnetic pole strength. |
| A. | Tm |
| B. | Am2 |
| C. | Am |
| D. | Tm2 |
| Answer» D. Tm2 | |
| 6. |
Identify the factor on which the torque on a planar current loop does not depend. |
| A. | Current |
| B. | Strength of magnetic field |
| C. | Area of the loop |
| D. | The shape of the loop |
| Answer» E. | |
| 7. |
Under which of these conditions, the torque acting on the current carrying loop is minimum? |
| A. | θ = 0o |
| B. | θ = 90o |
| C. | θ = 270o |
| D. | θ = 450o |
| Answer» B. θ = 90o | |
| 8. |
What is the maximum torque on a rectangular coil of area 4 cm × 80 cm of 400 turns, when carrying a current of 103 A in a magnetic field of 0.2 T? |
| A. | 1250 Nm |
| B. | 2560 Nm |
| C. | 3600 Nm |
| D. | 1985 Nm |
| Answer» C. 3600 Nm | |
| 9. |
What torque acts on a 50 turn coil of 200 cm2 area carrying a current of 20 A held with its axis at right angles to a uniform magnetic field of 0.2T? |
| A. | 8 Nm |
| B. | 0.8 Nm |
| C. | 4 Nm |
| D. | 0.8 Nm |
| Answer» D. 0.8 Nm | |