Physics Comprehension

16)(C)
Consider metal to be a no. of wires,of cross-sectional area=1.
Force on each wire=Bih=Bhj [i=j*a=j*1=j]
Total force=Bhj*w*l [force on one*no. of wires]
Pressure=force/area=Bhjwl/h*w=Bjl

17)(C)Flemings left hand rule.also hint from Q 18.

18)(A)
If metal is moving inwards,the free elec are moving inwards,the current is outwards,Hence force on elec. is downwards.Current is upwards.
Note that this induced current will make the metal move in the opp. direction,reference from Q17[in accordance with lenz's law]

Ans. 16C 17D 18B

@swaraj - i think your explanation is correct but your answer does not match.

Me too.

wherez d pic

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