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This paper tests electrostatics (Coulomb's law, electric field, flux, Gauss's law, potential, capacitors, dielectrics, dipoles) and current electricity (Ohm's law, resistance combinations, Kirchhoff's laws, drift velocit...
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In the given circuit, what will be the current passing through the 15 Ω resistor?
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Zero (by symmetry / balanced bridge condition).
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Consider the electrical network shown in the figure. The equivalent resistance between the terminals a and b is:
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4 Ω (balanced Wheatstone bridge).
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A parallel plate capacitor has a capacitance C. The distance between the plates is d. A dielectric slab of thickness d/2 and dielectric constant K is inserted between the plates. The new capacitance will be:
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2CK/(K+1).
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A copper wire of radius 1 mm contains 10²² free electrons per cubic metre. If a current of 10 A flows through the wire, the drift velocity of the electrons is: (charge of electron = 1.6 x 10⁻¹⁹ C)
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6.25 x 10⁻⁴ m/s (using v_d = I/(nAe)).
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