In April 2025
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A wave traveling 87 m/s has a wavelength of 4.6 m. What is the frequency of the wave (in Hz)?
A charge of 240C is moved when energy of 45J is applied between two points. Find the voltage between the two points.
A wire of length 2l is and resistance 2R is cut into two pieces and
then stretched twice of its previous length. Now first the:
connected in series the equivalent resistance is R, then they are
connected in parallel the equivalent resistance is Ry. The ratio
R2,:R1, would be
to be oscillatory?
X |4.00|4.75|5.25|6.00|6.75|7.50|8.00
Y |1.75|3.00|3.50|3.75|5.00|5.25|6.25
a. plot a graph of Y against X, use 1cm to represent I unit on both axis
b. measure the gradient
c. estimate the error in the gradient
d. measure the Y intercept
a) asi d’ rsonval meter movement with an internal resistan e Rm = 100 Ω and a full s ale
current of Im = 1 mA is to be converted into a multiple-range d.c voltmeter with ranges of
0 – 10 V, 0 – 50V, 0 – 250 V and 0 – 500 V. Find the values of the various resistances using
the potential divider arrangement.
A point charge q₁=4.00 nC is placed at the origin, and a second point charge q₂=-3.00 nC is placed on the x-axis at x=+20.0 cm. A third point charge q₃=2.00 nC is to be placed on the x-axis between q₁ and q₂. Let the potential energy of the three charges be zero when they are infinitely far apart.
a) what is the potential energy of the system of the three charges if q₃ is placed at x=+10.0 cm?
b) where should q₃ be placed to make the potential energy of the system equal to zero?
. The average potential difference between ground
and electrosphere, called the atmospheric electric potential, is approximately 240 kV.
In this model it is assumed that the Earth has a negative electric charge about 6 × 105
C, the resistance R1 under
thunderstorm cloud when lightnings are observed is of the order 104
– 105
Ω; R2 above thunderstorm cloud is
of the order 105
– 106
Ω; the load resistors R3 and R4 are equal to 15 Ω and 150 Ω respectively
1. In the circuit shown above, label the potential difference between electrosphere and ground.
2. Label the electric field pattern around R4.
3. Calculate the total load resistance.
4. Given that the capacitive effect between electrosphere and ground is 2.9 F, calculate the time constant
of this global electric circuit. (Hint: Use effective R as the series combination of resistors R3 and R4)
5. What is the significance of this time constant?
6. discuss the process of charge separation in thunderclouds.
