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An electron (m=9.11*10^ -31 kg,q=1.60*10^ -19 C) rest is accelerated through an electric potential difference of 12.0V. then enters a uniform magnetic field of 0.100 T (up), when initially moving (N)
a) Find the initial speed of the electron entering the magnetic field.
b) Find the magnetic force on the electron entering the magnetic field.
c) Find the radius of the circular path of the electron in the field .
A conductor of length 𝐿 moves at a steady speed vat right angles to a uniform magnetic field of flux density 𝐵. Show that the e.m.f. 𝐸 across the ends of the conductor is given by the
equation 𝐸 = 𝐵𝑙𝑣.
Consider two 100𝜇𝐹 capacitors. One is charged to10V, disconnected from the power supply, and then connected across the other. Calculate the energy stored by the combination
A conductor of length 𝐿 moves at a steady speed vat right angles to a uniform magnetic field of flux density 𝐵. Show that the e.m.f. 𝐸 across the ends of the conductor is given by the equation 𝐸 = 𝐵𝑙𝑣.
If three resistor are connected in series, what is the voltage drop in R1 if the value of R1= 12 ohm R2 = 20 ohm R3 = 5 ohm and the voltage source is Et = 24 volts
. Find the diameter of a copper wire which has the same resistance as aluminium wire of equal
length and diameter 1.20mm. The resistivities of copper and aluminium at room temperature are
1.7 × 10−8Ω𝑚 and 2.6 × 10−8Ω𝑚 respectively.
A piece of pencil lead is connected in series with an ammeter and a power supply. The power supply is turned on. After a few minutes, although the potential difference across the pencil lead does not change, the current in the circuit increases significantly. Explain why the current increases
Find the equivalent capacitance.
C1=3 µF, C2=5 µF, C3=2 µF, C4=2 µF, C5=4 µF, C6=6 µF
What is the electric potential at the center of a square of side length 2.0 m with alternating + 3C, –2C, +3C, and –2C charges placed at its vertices
Tungsten has a temperature coefficient of resistivity of 0.0045 oC-1. A tungsten wire is connected to a source of constant voltage via a switch. At the instant the switch is closed, the temperature of the wire is 28 oC, and the initial power delivered to the wire is Po. a) Calculate the temperature at which the power that is delivered to the wire be decreased to ½ Po. (3) b) Calculate by what factor the resistance of the tungsten wire has increased at this new temperature.
