1.A 900 pF capacitor is charged by a 100V battery. How much energy is stored by the capacitor ?
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2.An AC voltage of 200 V is applied to the primary of a transformer and a voltage of 2000 V is obtained from the secondary. Calculate the ratio of current passing through the primary to that in the secondary coil.
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3.If the temperature of the cold junction of a thermocouple is lowered, what will be the effect on its neutral temperature and temperature of inversion ?
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4.A charge of 5C is placed at the centre of a circle of radius 10 cm as shown in the figure below. Calculate the work done in moving a charge of 2C from point A to B on the circumference of the circle.
5.A 2V battery with internal resistance of 0.1 Ω is charged with a current of 5A. Calculate the potential difference between the terminals of the battery.
Electric potential, V = 2 V
r = 0.1 Ω, i = 5A
V = E + ir
= 2 + 5 x 0.1
V = 2.5 volt
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6.A rectangular coil of area 50 cm2 and 100 turns is placed perpendicular to a magnetic field of 10-2 Wb/m2. If the coil is withdrawn from the field in 40 milliseconds, calculate the emf induced.
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7.The electric main in a house is marked 220 V - 50 Hz. Write down the equation for the instantaneous voltage. The only variable in this equation should be ‘t’
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8.An ideal inductor in an ac circuit consumes no power, though both ‘V’ and ‘I’ are non zero. Why ?
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9.State Ampere’s circuital law.
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10.Light of wavelength 4500 Å in vacuum enters into a glass block of refractive index 1.5. What is the wavelength of light in the glass block ?
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