What we must know to determine the direction of the magnetic force on a charge are;
- The direction of the magnetic field.
- The velocity of the charge.
<h3>How to find the direction of magnetic force?</h3>
The magnetic force is the force of attraction or repulsion that emerges between electrically charged particles since of their movement.
From right hand rule, to determine the direction of the magnetic force on a charge, we must know;
- The direction of the magnetic field.
- The velocity of the charge.
Read more about Magnetic Force Direction at; brainly.com/question/18484862
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Answer:
1750 Joules.
Explanation:
Work done = force * distance
= 7 * 250
= 1750 Joules.
The correct answer of the question is : 0.001 s.
CALCULATION:
As per the question, the speed of sound v = 330 m/s
The frequency of the sound f = 990 Hz.
Let the wavelength of the wave is .
The wavelength of the wave is calculated as-
wavelength
=
= 0.33 m.
Now we are asked to calculate the time period.
The time period of the wave is reciprocal of frequency.
Mathematically time period T =
=
= 0.001 s.
As per the question, we need the period.
Hence, the period of the wave is 0.001 s.