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Sph 2172 Physics I 2011-2012 Second Intake Question Paper

Sph 2172 Physics I 2011-2012 Second Intake

Course:Physical Sciences

Institution: Dedan Kimathi University Of Technology question papers

Exam Year:2012

KIMATHI UNVERSITY COLLEGE OF TECHNOLOGY
DEPARTMENT OF MATHEMATICS AND PHYSICAL SCIENCES
SPH 2172 PHYSICS I 2011-2012 SECOND INTAKE
REVISION PROBLEMS
1. In the Bohr model, taking the radius of the hydrogen atom as , find the strength of the force on the electron, its centripetal acceleration and its orbital speed
2. Compute the electric potential at the centre of the triangle given in Fig.1

Fig.1. Problem 2
3. A system of three capacitors with respective capacitances , in parallel , is connected to a voltage supply . Find the charge on the system and on each capacitor separately. Calculate the total energy stored by the system
4. A parallel- plate air-filled having an area and plate spacing is charged to a potential difference of Find (a) the capacitance (b) the magnitude of the charge on each plate(c) the stored energy, (d) the electric field between the plates(e) the energy density between the plates.
5. Three resistors are connected in parallel to a voltage supply of . Find the current and the power dissipated in each. Check if the power is an additive quantity: the total power dissipated in the system equals the sum of powers dissipated in its parts.
6. A straight conductor long is placed at an angle in a magnetic field and experiences a force . Determine the magnetic vector if the current through the conductor is
7. What the current flows through a conductor placed in a magnetic field that experiences a repulsion force . the angle between the conductor and direction of the field is
8. A voltage is applied across a . What is the RMS voltage? What will an AC ammeter in series with the resistor read?
9. A coil has resistance and inductance . Compute its reactance and its impedance to an AC current of

10. A capacitor is in series with a resistor of and is connected to a AC line. The reactance of the capacitor is . Determine (a) the capacitance of the capacitor (b) the current in the circuit (c) the phase angle between the current and the supply voltage and (d) the power loss in the circuit
11. Two AC emf and are fed in series to the same circuit. Give the phasor diagram of such a combination

12. A series circuit consisting of a resistor, a coil of inductance and a capacitor is connected across a , power line. Find (a) the peak and RMS value of the current (b) the total impedance of the circuit (c) the power loss (c) the phase angle between the current and the source voltage (d) voltmeter readings across each elements
13. Imagine an electromagnetic plane wave in vacuum whose field is given by: , . Determine the speed, frequency, wavelength, period, initial phase, -field amplitude and polarization. Which region of the electromagnetic spectrum does the wave belong to?

Sph 2172 Physics I 2011-2012 Second Intake Question Paper

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