Physics

ICSE Class 12

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C = 900 PF = 900 x 10^{-12} F

V = 100V

Energy stored in the capacitor is given by,

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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.

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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.

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6.
A rectangular coil of area 50 cm^{2} and 100 turns is placed perpendicular to a magnetic field of 10^{-2} Wb/m^{2}. If the coil is withdrawn from the field in 40 milliseconds, calculate the emf induced.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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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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