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Department of Engineering
Physics 2
Assignment – 1*
Q.1. A long, straight wire carries a 15A current along the +y axis. What is the
force on an electron located instantaneously at x = 6cm and moving with
a speed of 106 m/s in the following directions:
(a) away from the wire along the +x axis
(b) parallel to the +y axis;
© parallel to the +z axis?
Q.2. In a certain experiment protons (mp, qp) and α particles (mα = 4mp ;
qα = 2qp) must move with the same radius perpendicular to a magnetic
field whose strength can be changed. Find the ratio of the field
strengths needed if they have the same value for the following:
(a) speed
(b) linear momentum
© kinetic energy
Q.3. An ac source of emf with frequency 50 Hz and a peak(maximum)
potential difference of 100V is in an RLC series circuit with R = 9Ω,
L = 0.04 H and C = 100µF. Find:
(a) the impedance
(b) the phase angle
© the peak (max.) potential difference across each element.
Q.4. In an RLC series circuit R = 50 Ω, C = 80 µF and L = 30mH. The 60 Hz
source has an rms potential difference of 120V. Find:
(a) the rms current and potential difference for each element
(b) the power factor
© the rms power delivered by the source
(d) the resonance frequency
(e) the peak values of potential difference for each element at the
resonance frequency.
Q.5. A 6 µF capacitor has a reactance of 11 Ω.
(a) What would be the reactance of a 0.2 mH inductor at the same
frequency?
(b) At what frequency would the reactance be equal?
Q.6. A circuit consists of a capacitor of 2 µF and a resistor of 1000 Ω. An
alternating e.m.f. of 12V (r.m.s.) and frequency 50Hz is applied. Find
(a) the current flowing
(b)the voltage across the capacitor
© the phase angle between the applied e.m.f. and current
