A cell of e.m.f. 1.5 V and internal resistance of 2.59 is connected in series with an ammeter of resistance 0.59 and a resistor of resistance 7.09. Calculate the current in the circuit.
A. 0.15 A B. 0.20 A C. 0.60A D. 3.00A E. 6.67A. Correct Answer: Option A – 0.15 A Explanation I = E/R + r = 1.5/2.5 + 0.5 + 7 = 0.15
Birds can perch safely on overhead electric power cables without being electrocuted because?
A. birds can withstand high p.d. of the electric power cables B. any accumulated charge on the birds is quickly dissipated C. the feet of the birds are well insulated D. the current is a.c. and has particular direction E. there is no p.d between the birds and the...
Calculate the resistance of the filament of a lamp rates 240V; 40W?
A. 240Ω B. 360Ω C. 720Ω D. 1440Ω E. 2880Ω Correct Answer: Option D – 1440Ω Explanation R = V²/P = 240²/40 = 1440ΩA work of 30 joules is done is transferring 5 millicoulombs of charge from a point B to a point A in an electric Held. The potential difference between B and A is?
A. 1.7 x 10^-4V B. 3.4 x 10^-4V C. 1.5 x 10−¹V D. 6.0 x 10³V E. 1.2 x 10^4V Correct Answer: Option D – 6.0 x 10³V
What is the electric potential energy between two protons each of charge q and at a distance of r apart? (Permittivity of free space = εo)
A. 4πεoq²r B. qr/4πεo C. q/4πεor D. q²/4πεor E. q²/4πεor Correct Answer: Option C – q/4πεorProducts
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