Which of the following will NOT affect the induced emf in a circuit?

• Strength of the magnet

• Number of turns in a coil

• The loads connected to the circuit

• Motion between the magnet and the coil

In which direction does conventional current flow?

• Negative to positive

• Negative to negative

• Positive to positive

• Positive to negative

According to the right-hand rule, if a magnetic field is thrusted downwards and the magnetic field is towards the left, what is the direction of the current produced in the loop?

• Upward

• Downward

• Into the page

• Out of the page

A current is induced on a loop as a magnet moves inside a coil in the diagram on the right. What happens to the current when the magnet is pulled out?

• The current stops.

• The current reverses.

• The current increases.

• The current moves outside the loop

Magnetic field lines having magnitude 1.4 T pass through a surface having area 6.0 m2. The field lines make an angle of 40⁰ with the plane of the surface. What is the magnetic flux passing through the surface?

• 1.35 Wb

• 2.71 Wb

• 5.08 Wb

• 6.43 Wb

A coil has 400 turns of area 48 cm2. It flips from vertical position (0⁰) to horizontal position (90⁰) in a time of 0.05 s. What is the induced emf if the constant B-field is 5 mT?

• 0.080 V

• 0.192 V

• 9.60 × 10-3 V

• 4.80 × 10-4 V

A 0.80 m length of wire moves at a constant speed of 8 m/s in at 120⁰ with a 0.5T B-Field. What is the magnitude of the induced emf in the wire?

• 0.1 V

• 0.4 V

• 1.6 V

• 2.8 V

A higher value of _______ signifies a higher value of energy in a wave.

• Amplitude

• Wavelength

• Period

• Wave speed

A sound wave is able to travel through the air at a speed of 300 m/s and a frequency of 15,000 Hz. What is its wavelength?

• 0.2 m

• 0.02m

• 50 m

• 4,500,000 m

What is the energy of a photon from the red color of the visible light spectrum, if it came from the red part of the visible light spectrum (λ = 700 nm)?

• 2.84 × 10-19 J

• 1.06 × 10-36 J

• 1.39 × 10-31 J

• 4.64 × 10-31 J