Classify each of the following statements as a characteristic (a) of electric forces only, (b) of magnetic forces only, (c) of b
1 answer:
(b) Magnetic forces only
When an object is placed in an electric field it experiences an electric force given by :
= |q| × E
Similarly when it is placed in a magnetic field it experiences a magnetic force given by :
= |q|×v×Bsinθ
When a particle is placed in electric field the particle gets accelerated.
The electric field has a direction, positive to negative. This is the direction that the electric field will cause a positive charge to accelerate. For example If a positive charge is moving in the same direction as the electric field vector the particle's velocity will increase. If it is moving in the opposite direction it will decelerate. ( No change in direction of motion in this case)
When a particle is moved in magnetic field ,the magnetic force is perpendicular to velocity and magnetic field . Since force is perpendicular to velocity ,it only changes the direction of motion.
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Answer:
C. f = 440 Hz
Explanation:
- In any wave, there is a fixed relationship between the wavelength (distance between two sucesive crests), the frequency (number of cycles per unit time) and the perturbation speed, as follows:
where v = speed of the wave
λ = wavelength
f = frequency
- Replacing by the givens in (1) and solving for f, we have:
- f = 440 Hz