Q7 of 47 Page 408

A cooper wire is held between the poles of a magnet.


The current in the wire can be reversed. The pole of the magnet can also be changed over. In how many of the four directions shown can the force act on the wire?

The force on the wire due to the interaction of magnetic fields of the bar magnet and current carrying wire can act only in upwards or downwards direction.

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3

Three plotting compasses are to a solenoid carrying a current. How many of the compass needles will change direction, if the current through the solenoid is increased?

(Ignore the effect of the earth’s magnetic field).

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A ship is to reach a place 8° south of west. In what direction should the ship be steered if declination at the place is 18° west?

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A rectangular loop carrying a current is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If a steady current its created in wire as shown in figure below, then the loop will

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Four metal rods are placed, in turn, inside a coil of copper wire,


The table below gives the results of the experiment. Which rod would be the most suitable to use for the case of a coil in a circuit breaker?