MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A rectangular coil, of sides 4 cm and 5 cm respectively, has 50 turns in it. It carries a current of 2 A, and is placed in a uniform magnetic field of 0.5 T in such a manner that its plane makes an angle of 60o with the field direction. Calculate the torque on the loop. |
| A. | 5 10<sup>-4</sup> N m |
| B. | 5 10<sup>-2</sup> N m |
| C. | 5 10<sup>-3</sup> N m |
| D. | 5 10<sup>-5</sup> N m |
| Answer» C. 5 10<sup>-3</sup> N m | |
| 2. |
A solenoid has core of a material with relative permeability 200 and its windings carry a current of 2 A. The number of turns of the solenoid is 200 per meter. What is the magnetization of the material? |
| A. | 6 10<sup>4</sup> A/m |
| B. | 7 10<sup>4</sup> A/m |
| C. | 8 10<sup>4</sup> A/m |
| D. | 9 10<sup>4</sup> A/m |
| Answer» D. 9 10<sup>4</sup> A/m | |
| 3. |
A long solenoid has 500 turns per cm and carries a current I. The magnetic field at its center is 7.54 10-2 Wb m-2. Another long solenoid has 300 turns per cm and it carries a current ( frac {I}{3} ). What is the value of magnetic field at the center? |
| A. | 1.50 10<sup>-3</sup> Wb/m<sup>2</sup> |
| B. | 1.50 10<sup>-5</sup> Wb/m<sup>2</sup> |
| C. | 1.05 10<sup>-3</sup> Wb/m<sup>2</sup> |
| D. | 1.50 10<sup>-2</sup> Wb/m<sup>2</sup> |
| Answer» E. | |
| 4. |
Magnetic field in toroid is stronger than that in solenoid. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
Two concentric coils of 20 turns each are situated in the same plane. Their radii are 60 cm and 80 cm and they carry currents 0.4 A and 0.5 A respectively in opposite directions. Calculate the magnetic field at the center. |
| A. | ( frac {5 mu_0}{4} ) |
| B. | ( frac {5 mu_0}{6} ) |
| C. | ( frac {5 mu_0}{8} ) |
| D. | ( frac {5 mu_0}{10} ) |
| Answer» C. ( frac {5 mu_0}{8} ) | |
| 6. |
A solenoid of 0.5 m length with 100 turns carries a current of 5 A. A coil of 20 turns and of radius 0.02m carries a current of 0.6 A. What is the torque required to hold the coil with its axis at right angle to that of solenoid in the middle point of it? |
| A. | 1.60 N m |
| B. | 15.89 10<sup>-5</sup> N m |
| C. | 1.893 10<sup>-5</sup> N m |
| D. | 1.893 10<sup>-8</sup> N m |
| Answer» D. 1.893 10<sup>-8</sup> N m | |
| 7. |
Pick out the expression for magnetic field inside a toroid from the following. |
| A. | B = <sub>0</sub> NI |
| B. | B = 2 <sub>0</sub> NI |
| C. | B = ( frac { mu_o}{NI} ) |
| D. | B = ( frac { mu_o N}{I} ) |
| Answer» B. B = 2 <sub>0</sub> NI | |