WILL GIVE BRAINLIEST
The differences between microwaves and infrared radiation are due to differences in their . (1 point)
Means of propagation
Wavelength and frequency
Speed of travel
Visibility to the human eye

A deuteron consists of one proton and one neutron. A deuteron moving horizontally enters a uniform, vertical magnetic field of 0.500 T. It then travels in a circular arc of radius 55.6 cm. How fast was the deuteron moving just before it entered the field? Let the mass of the deuteron m = 3.34 × 10^–27 kg and the charge on a proton q = 1.60 × 10^–19 C. (1 point)
9.94 × 10^7 m/s
1.33 × 10^7 m/s
3.34 × 10^7 m/s
7.52 × 10^6 m/s

A proton enters a magnetic field at a speed of 7.8 × 10^4 m/s. The magnetic field is oriented at a 45° angle to the direction of the proton, and the strength of the field is a constant 3.0 T. What is the magnitude of the force acting on the proton? Let the charge of the proton equal 1.6 × 10^−19 C. (1 point)
2.6 x 10^-14 N
1.2 x 10^-14 N
7.2 x 10^-14 N
2.0 x 10^-13 N

Which object does not generate a magnetic field in the space around it (1 point)
Electric current traveling through a wire
A bar magnet
A stationary point charge
An electron moving around an atomic nuclei

A transformer draws 24 W of power from a 220 V power line, stepping the voltage down to 7.5 V. What is the equivalent resistance of the input circuit? (1 point)
2900 Ω
2000 Ω
1100 Ω
440 Ω

Which statement forms the basis of Faraday’s law of induction? (1 point)
A current flowing through a wire establishes a magnetic field.
A permanent magnet creates a magnetic field at all points in the surrounding space.
A changing magnetic flux establishes a current in a circuit.
The magnetic moment of a conducting loop carrying current depends on the area of the loop.

Which characteristic is common to all permanent magnets? (1 point)
At least one pole, but not necessarily two poles.
A bar shape with or without poles.
Two poles, identified as north and south.
Either two poles, four poles, or eight poles.

A neutral atom of calcium has 20 protons and 22 neutrons. How many electrons does it have? (1 point)
20
22
42
2
The diagram does not represent a real electric field because the field lines . (1 point)

Cross at many points.
Lead from two point charges of equal magnitude
Lead from two point charges of equal sign
Extend indefinitely into space

Point charge q1 of 30 nC is separated by 50 cm from point charge q2 of −45 nC. As shown in the diagram, point a is located 30 cm from q1 and 20 cm from q2. What are the magnitude and direction of the electric field at point a? Let the electrostatic constant k = 8.99 × 10^9 N · m2/C2. (1 point)

7000 N/C, directed to q2
13,000 N/C, directed to q2
13,000 N/C, directed to q1
7000 N/C, directed to q1

A scientist wants to charge an object by induction. Which statement best explains why the object should be insulated?
(1 point)
The charges from the rod can enter the object, but no charges can leave it.
The charges stay bound to nuclei in the object’s atoms and do not move within the object.
The charges can escape the object, but new charges cannot enter it.
The charges can shift throughout the object, but they cannot escape.

A 25 V battery is connected into a circuit with two resistors in series. One resistor has resistance 5.0 Ω and the other has resistance 7.5 Ω. What is the voltage drop across the 7.5 Ω resistor? (1 point)
15 V
25 V
10 V
0 V

A Nichrome (TM) wire has a resistance of 100.00 Ω at 11.5ºC. What is the resistance of at 10.0ºC ? The temperature coefficient of resistivity for Nichrome (TM) is 0.00040 (Cº)^-1. (1 point)
99.94 Ω
95.54 Ω
90.02 Ω
97.99 Ω

An aluminum bar 3.80 m long has a rectangular cross section 1.00 cm by 5.00 cm. What length of copper wire with a 1.50 mm diameter has the same resistance? Let ρ alum =2.63 x 10^-8 Ω • m. Let ρcopper = 1.72 x 10^-8 Ω • m (1 point)
1.50 cm
3.50 cm
2.05 cm
2.75 cm