Magnetism and Electromagnetic Induction
What creates a magnetic field?
Two bar magnets are brought close to each other. Which of the following statements is always true?
A short bar magnet is placed near a point P. Which of the following could affect the strength of the magnetic field measured at point P?
A charge of 2 Coulombs is placed in an electric field of 5 N/C. What is the magnitude of the electric force on the charge?
Which of the following creates a magnetic field?
A conducting rod is moving through a uniform magnetic field. Which factors affect the magnitude of the induced EMF in the rod?
An electron is moving with a velocity of 2 \times 10^6 m/s perpendicular to a magnetic field of 0.5 T. What is the magnitude of the magnetic force on the electron?
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What is magnetic flux?
A straight wire carries a current from left to right. Using the right-hand rule, what is the direction of the magnetic field above the wire?
A long solenoid is tightly wound with turns per unit length and carries a current . What happens to the magnetic field inside the solenoid if the number of turns per unit length is doubled and the current is halved?