Physics Questions
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A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance d from the wire. To measure a field of 5 mT due to this wire, you would have to go to a distance from the wire of
The magnetic field lines due to a straight, current-carrying wire are __________.
the required ocular amplitude is ___ that the spectacle amplitude for a hyperope
true or false: myopes, when corrected with spectacles have to exert more ocular accommodation than either emmetropes or corrected hyperopes.
true or false: hyperopes will have to exert more ocular accommodation than either emmetropes or corrected myopes to focus on a given near object
the closest point at which an object can be placed along the optical axis for its image to be focused on the retina when accommodation is maximally exerted
the point at which an object must be placed along the optical axis for its image to be focused on the retina when the eye is NOT accommodating
accommodation adds ____ power to the eye
the closest point of clear vision after accommodating
A circular wire ring is situated above a long straight wire, as shown in the figure. The straight wire has a current I flowing to the right, and this current is increasing at a constant rate. Which of the following statements is true?
The wire in the figure carries a current I that is decreasing with time at a constant rate. The wire and the three loops are all in the same plane. What is true about the currents induced in each of the three loops shown?
the linear distance between the far point and the near point of accommodation
range of accommodation is the ____ ____ between the far point and the near point of accommodation
The sinoatrial (SA) node maintains and establishes the heart's rhythm. The SA node emits pulses of current through gap junctions in cardiac tissue to stimulate atrial contractions. The pacemaker emits a 1ms pulse of 2A current every second. If the gap junction has a approximate resistance of 10 Ω , how much energy is dissipated by the cardiac muscle? a) 0.04 J b) 40 J c) 20 J d) 0.02 J
Street lights restrict the flow of electric current across themselves. Two traffic lights are wired in parallel, one with resistance 10 Ω and another with resistance R. If the traffic light circuit is rated at 2 kW when supplied with 100V, what is the value of R? a) 120 Ω b) 10 Ω c) 15 Ω d) 240 Ω
Which of the following are the main purposes for a Capacitor on the MCAT? I. Creating uniform Electric Fields II. Regulating the movement of Charges within a Circuit III. Storing Electrical Potential Energy
Voltage is ___ in positively-charged regions and ___ in negatively-charged regions(A) low, high (B) high, low
Ohmmeters are also a useful meter for measuring resistance. Which of the following statements about the Ohmmeter is true? (A) The Ohmmeter should not be hooked up to an active circuit, or it risks false readings and damage. (B) The Ohmmeter relies upon an outside battery charge, and can adapt to different voltages. (C) The Ohmmeter measures the active circuit's voltage and current, and will give the equivalent resistance. (D) All of the above statements are true.
Each capacitor in series has equal ___ but different ____. (charge/voltage)
What equations can be used to represent electric field?