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Transistors has replaced __________. (diodes, vacuum tubes, rectifiers, photovoltaic cell)

Asked by Narendra Kumar Sharma 18/02/2015 Last Modified 18/02/2015

44 Answers

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A point pole has a strength of 4? × 10-4 weber. The force in newtons on a point pole of 4? × 1.5 × 10-4 weber placed at a distance of 10 cm from it will be a.) 20 N. b.) 15 N. c.) 7.5 N. d.) 3.75 N.

Solution: m1 = 4N × 10^-7, m2 = 4N × 1.5 × 10^-4; r = 10 cm. F= (m1 m2)/( 4 pi mue0 r^2) = (4N 10^-7 x 4N 10^^-4)/(4N x 4N x 10^-7(10 x10^-2)^2 =15N

Kumar Upendra Akshay

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following some questions are very important for coming board exam : - The field at any point on the axis of a current carrying coil will be a.) parallel to axis. b.) perpendicular to the axis. c.) at angle of 45° with the axis. d.) zero.

A. Parallel to the axis

Kumar Upendra Akshay

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On Celsius scale boiling point of water is taken as __________. (0°C, 100°C, 180°C, None of these

100°C

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The field at any point on the axis of a current carrying coil will be a.) parallel to axis. b.) perpendicular to the axis. c.) at angle of 45° with the axis. d.) zero.

Kumar Upendra Akshay

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The electromotive force is written as __________. (E = W/q, E = Wq, E = Q/I, None of these)

dE = dW/dq

Narendra Kumar

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