Digital Electronics
The effect of stray magnetic field on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are

  Parallel.
 Inclined at 30°.
 Inclined at 60°.
 Perpendicular.

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

0 any input causes the output to be at logic 0
1 at any input causes the output to be at logic 1
1 at any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.

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