Answer:
a
because the mechanical wave is when it goes over and over again
Explanation:
If a positive test charge is placed in an electric field, it will exert the force in the test charge in the direction of electric field vector. We know that the direction of electric field is given by electric field lines. The field lines for a positive charge is outwards. The electric force acting on the charge is given by :
F = q E
Hence, this is the required solution.
The correct answer is magnetic field, electric field, and charges.
Time period = 1 / frequency
Time period = 1 / 250 th of a second
