Emi

Question 1

1. A coil is placed in a changing magnetic field but the circuit is open what will be observed? (A) No EMF no current (B) EMF present current zero (C) Current present EMF zero (D) Both EMF and current present, A: (B) EMF present current zero
   
   2. The amplitude of action potentials analogy suggests EMF in a circuit primarily controls which quantity? (A) Charge magnitude (B) Current flow rate (C) Resistance (D) Electron mass, A: (B) Current flow rate
   3. A battery is connected to a broken wire what happens? (A) No EMF no current (B) EMF zero current flows (C) EMF present current zero (D) Both increase, A: (C) EMF present current zero
   4. In a closed circuit if resistance becomes infinite what happens to current and EMF? (A) Both zero (B) Current zero EMF present (C) Current increases EMF decreases (D) Both increase, A: (B) Current zero EMF present
   5. According to Faraday’s Law of Electromagnetic Induction if magnetic flux changes in an open loop what is induced? (A) Only current (B) Only EMF (C) Neither (D) Both equally, A: (B) Only EMF
   6. A conducting loop moves in a uniform magnetic field with no change in flux what happens? (A) EMF and current both exist (B) Only EMF exists (C) Neither EMF nor current exists (D) Only current exists, A: (C) Neither EMF nor current exists
   7. Which factor directly determines whether current flows in a circuit with induced EMF? (A) Magnetic field strength (B) Presence of closed path (C) Length of wire (D) Charge of electron, A: (B) Presence of closed path
   8. If EMF is induced but charges cannot move what is zero? (A) Voltage (B) Resistance (C) Current (D) Energy, A: (C) Current
   9. In a circuit doubling EMF while keeping resistance constant will do what? (A) Double current (B) Zero current (C) No change (D) Halve current, A: (A) Double current
   10. Which statement is correct about EMF? (A) It is a force on charges (B) It is energy per unit charge (C) It is flow of electrons (D) It is resistance, A: (B) It is energy per unit charge