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1.
A charge + 
is moving upwards vertically. It enters a magnetic field directed to north. The force on the charge will be towards
is moving upwards vertically. It enters a magnetic field directed to north. The force on the charge will be towards
2.
A length of wire carries a steady current. It is bent first to form a circular coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is
3.
A particle of mass 
and charge 
moves with a constant velocity 
along the positive 
direction. It enters a region containing a uniform magnetic field 
directed along the negative 
direction, extending from 
to 
. The minimum value of required so that the particle can just enter the region 
is
and charge moves with a constant velocity along the positive direction. It enters a region containing a uniform magnetic field directed along the negative direction, extending from to . The minimum value of required so that the particle can just enter the region is
4.
and 
are parallel conductors of equal length carrying currents 
and 
respectively. Distance between 
and is . Distance between and is also . 
is the force exerted by on and 
is the force exerted by on . Choose the correct answer
and are parallel conductors of equal length carrying currents and respectively. Distance between and is . Distance between and is also . is the force exerted by on and is the force exerted by on . Choose the correct answer
5.
When a positively charged particle enters a uniform magnetic field with uniform velocity, its trajectory can be
(1) a straight line
(2) a circle
(3) a helix
(1) a straight line
(2) a circle
(3) a helix