Ques.1. Find H = ___________ A/m at the center of a circular coil of diameter 1 m and carrying a current of 2 A.
Ques.2. What is the SI unit for magnetic reluctance?
Ques.3. Which of the following materials is used for the generation of ultrasonic waves by using magnetostriction effect?
- Paramagnetic material
- Ferromagnetic material
- Diamagnetic materials
- Both paramagnetic and diamagnetic material
Ques.4. In Lenz’s law the induced emf ‘e’ opposes the-
- Change in flux
- Both the flux and change flux
- None of the options
Ques.5. According to Gauss’s law, the electric field due to an infinitely long thin charged wire varies as:
Ques.6. According to Gauss’s law, if E is _________ the charge density in the ideal conductor is zero.
Ques.7. The force per unit length between two stationary parallel wires carrying (steady) currents _____.
- Is inversely proportional to the separation of wires
- Is proportional to the magnitude of each current
- Satisfies Newton’s third law
- All of the above
Ques.8. What is analogous to electric field in magnetic circuits?
- Magnetic Field
- Magnetic flux density
- Magnetomotive force
Ques.9. Which of the following effect proves the wave nature of light?
- Photoelectric effect
- Compton effect
- Pair production
Ques.10. In the magnetic circuit shown below, what is the flux density produced if the relative permeability of the core material under the given condition is 1000?