Question

Ans.(1)
35 If normal force becomes two times, then coefficient
of friction-
(1) two times,
(3) remains same,
(2) four times,
(4) half.
​

Answer 1

Answer:

Un changed

Explanation:

The coefficient of friction is constant for two given surfaces in contact and it does not depends upon the normal reaction. So, the coefficient of friction remains unchanged.

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Answer 2

Answer:

Right-Hand Thumb rule. Assume that you are holding a straight current-carrying conductor in your right hand such that the thumb points towards the direction of the current. Then your fingers will wrap around the conductor in the direction of field lines of the magnetic field.