Force on electron due to electric field is given by
now the acceleration is given by
so above is the magnitude of acceleration and its direction is opposite to field as electron is negatively charged so direction is towards SOUTH
When two trains, going in opposite directions, are passing on tracks that are laid out close together, the train cars can often
2 answers:
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Answer:
Explanation:
Firstly, when you measure the voltage across the battery, you get the emf,
E = 13.0 V
In order to proceed we have to assume that the voltmeter offers no loading effect, which is a valid assumption since it has a very high resistance.
Secondly, the wires must be uniform. So the resistance per unit length is constant (say z). Now, even though the ammeter has very little resistance it cannot be ignored as it must be of comparable value/magnitude when compared to the wires. This is can seen in the two cases when currents were measured. Following Ohm's law and the resistance of a length of wire being proportional to it's length, we should have gotten half the current when measuring with the 40 m wire with respect to the 20 m wire (). But this is not the case.
Let the resistance of the ammeter be r
Hence, using Ohm's law we get the following 2 equations:
.......(1)
......(2)
Substituting the value of r from (2) in (1), we have,
which simplifying gives us, (which is our required solution)
putting the value of z in either (1) or (2) gives us, r = 0.5325
<u>Answer:</u>
The acceleration of the car is
<u>Explanation:</u>
In the question it is given that car initially heads north with a velocity . It then accelerates for
and in the end its velocity is
.
initial velocity
time
final velocity
The equation of acceleration is
The value of acceleration is positive, here since the car is speeding up. If it was slowing down the value of acceleration would be negative.