Physicsmedium · Past Paper
Which of the following does NOT affect the strength of an electromagnet?
ACurrent in the coil
BNumber of turns
CDirection of current
DNature of core material
✓ Correct Answer: C — Direction of current
Changing the direction only flips the poles; it does not change the magnitude of the magnetic field strength.
Share this question
More from Physics
- Calculate the refractive index of a medium if the speed of light in that medium is 2 x 10^8 m/s.
- If distance s = 2t + 5t^2, then the initial velocity is:
- A body of mass 2 kg is thrown upward with a velocity of 10 m/s. Its KE at the time of projection is:
- What is the angle of incidence when a ray of light is reflected back along its own path from a spherical mirror?
- A balloon is at a height of 81m and is ascending with a velocity of 12 m/s. A body is dropped from it. If g=10, the body reaches ground in: