(a) The first law of thermodynamics may be expressed in the form ΔU = q + w. (i) State, for a system, what is meant by: 1. +q

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The variation with temperature of the resistance RT of a thermistor is shown in Fig. 6.1. The thermistor is connected into the circuit of Fig. 6.2.

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Explain the use of a uniform electric field and a uniform magnetic field for the selection of the velocity of a charged particle. You may draw a diagram if you wish.

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A U-tube closed at one end contains mercury. Air at a pressure of 5.0×104 Pa is trapped at the closed end. The other

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(a) Define electric potential at a point. (b) An isolated solid metal sphere is positively charged.

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