Electromagnetism

What is the output of a step-up transformer having a turns ratio of 1:50, if 50V DC is applied at its primary coil?

 
 
 
 

Which of the following parts is responsible for DC motor coil to rotate in one direction?

 
 
 
 

According to Right-hand palm rule, fingers indicate

 
 
 
 

If magnetic field in a conductor, passing perpendicularly through cardboard, is anticlockwise then direction of current in it due to free electrons is

 
 
 
 

A conductor is placed horizontally, direction of current in it is in east, magnetic field is out of page, perpendicular to conductor. What is the direction of magnetic force on the conductor?

 
 
 
 

The device which converts mechanical energy into electrical energy

 
 
 
 

A transformer has 100 turns in the primary and 500 turns in the secondary, if 6 volts is applied across its primary, the voltage induced across its secondary would be

 
 
 
 

If a magnet is moved towards a coil with uniform acceleration, magnitude of induced emf in the coil

 
 
 
 

Step-up transformer increases

 
 
 
 

f a coil moves parallel to a uniform magnetic field, the induced emf will be

 
 
 
 

Direction of magnetic field inside a permanent bar magnet is

 
 
 
 

Question 1 of 11

Related Questions:

  1. Physics 10 MCQ
  2. Simple harmonic motion and waves
  3. Simple harmonic motion and waves-NFE
  4. Give an example of vibratory motion which is not simple harmonic motion. Give a reason for your selection.
  5. At the extreme position, velocity is zero but acceleration is maximum in simple harmonic motion. How can you theoretically explain it?
  6. What will happen to the acceleration of a mass-spring system if its mass is doubled?
  7. A simple pendulum has a time period “T”. What will happen to its time period if its thread length is shortened to half?
  8. A simple pendulum has a time period of 4 seconds. Will its time period remain the same or change if its steel bob is replaced by a wooden bob of the same size?
  9. Same masses are attached to different springs, one is vibrating faster. Why?
  10. A simple pendulum has a time period “T” in Murree. In Karachi, it has a different time period. What would you do to make its time period the same as it was in Murree?
  11. What will happen to the frequency of waves in a ripple tank if the time period of the electrical vibrator is decreased? What will happen to the wave speed?
  12. Why do water waves refract at the boundary of shallow water and deep water in a ripple tank experiment?
  13. Under what conditions are waves diffracted the most?
  14. What do you mean by oscillation? Define simple harmonic motion. What are the conditions for a body to perform SHM? Give examples of bodies that perform SHM.
  15. Show that a vibrating mass-spring system performs simple harmonic motion. What is its time period? On what factors does it depend?
  16. Explain the following terms for SHM: Vibration, amplitude, time period, frequency.
  17. Explain that a steel ball dropped from the edge of a shining bowl performs SHM.
  18. What is a simple pendulum? Show that a vibrating simple pendulum performs SHM. What is the formula for the time period of a simple pendulum? On what factors does it depend?
  19. Explain the process of damping. Differentiate between damped and undamped oscillations.
  20. Define the term wave. Explain it with the help of an example. Differentiate between mechanical waves and electromagnetic waves.

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