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?
What is the direction of electric field lines?
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?
Three positive charges are arranged in an equilateral triangle. What is the direction of the net electric field at the center of the triangle?
Which of the following creates a magnetic field?
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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?
What is the key principle behind Faraday's Law?