NDA Government Jobs Exams

A current-carrying wire is known to produce magnetic lines of force around the conducting straight around
wire. The direction of the lines of force may be described by -
(a) left-had thumb rule for up-current and right-hand thumb rule for down-current
(b) right-hand thumb rule for up-current and left-hand thumb rule for down-current
(c) right-hand thumb rule for both up and down currents
(d) left-hand thumb rule for both up and down currents

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NDA Other Question
If d denotes the distance covered by a car in time t and
→S
denotes the displacement by the car during the
same time, then -
(a) d ≤ |
→
S |
(b) d = |
→S
| only
(c) d ≥ |
→S
|
(d) d < |
→
S | If an object undergoes a uniform circular motion, then its -
(a) acceleration remains uniform
(b) velocity changes
(c) speed changes
(d) velocity remains uniform