question archive 1)a)i)A circular coil with area 0
1)a)i)A circular coil with area 0
Subject:PhysicsPrice: Bought3
1)a)i)A circular coil with area 0.07 m^2 has 25 turns and diameter 0.06 m.It is placed in a uniform magnetic field of strength 250mT.The plane of the coil and the direction of the field make an angle of 20 degrees.Determine the magnetic flux that passes through the coil. (2marks)
ii)State two (2)properties of an electrostatic force.
(2marks)
iii)Describe Gaussian's Law for a charge surrounded by an enclosed surface. (2marks)
iv)Evaluate the impact on the capacitance of a capacitor after inserting dielectric material with a higher dielectric constant K. (2marks)
b)i)State Kirchhoff's Rules. (2marks)
ii)State two (2)properties of a magnetic field line.
(2marks)
iii)A long straight wire carries a current of 5A.A particle charge of +10 micro C is moving parallel to the wire at a distance of 5mm.Determine the magnitude of the magnetic force exerted on the moving charge if the velocity of the charge is 300m/s. (6marks)
iv)At certain location,the Earth's magnetic field has a magnitude of 5.9 × 10^-5 T and points in a direction that is 80 degrees below the horizontal.Compute the magnitude of the magnitude flux through the surface area of 9m^2 at the horizontal. (3marks)
c)i)An emf is induced in a conducting loop of wire 1.5m long as its shape is changed from circular to square.Determine the average magnitude of the induced emf if the change in shape occur in 4.25s,and local 0.205 T magnetic field is perpendicular to the plane of the loop. (6marks)
ii)Explain the effect of the increase in the number of turns of the primary coils towards the voltage and current in the secondary coils of an ideal transformer. (2marks)
iii)A resistor,a pure inductot and a pure capacitor is connected in a series to an AC power supply to form a RCL circuit.The AC supply is Vrms=240 V and
f=60.0Hz.Given the resistance,inductance and capacitance are 40.0 Ohm,200mH and 300 micro F respectively,calculate the impendance (Z) of the circuit. (6marks)
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