A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
continue to move due east
move in a circular orbit with its speed unchanged
move in a circular orbit with its speed increased
gets deflected vertically upwards
A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed is both the cases, then the ratio of the magnetic induction at their centers will be :
2 : 1
1 : 4
4 : 1
1 : 2
opposes the magnetic field
The total charge induced in a conducting loop when it is moved in magnetic field depends on :
the rate of change of magnetic flux
initial magnetic flux only
the total change in magnetic flux
final magnetic flux only
Tesla is the unit of :
magnetic flux
magnetic field
magnetic induction
magnetic moment
Current is flowing in a coil of area A and number of turns N, then magnetic moment of the coil, M is equal to :
NiA
Ni/A
N2Ai
The magnetic field at a distance r from a long wire carrying current I is 0.4 T. The magnetic field at a distance 2r is :
0.2 T
0.8 T
0.1 T
1.6 T
A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane becomes
inclined at 45o to the magnetic field
inclined at any arbitrary angle to the magnetic field
parallel to the magnetic field
perpendicular to magnetic field
A galvanometer of resistance 50 Ω is connected to a battery of 3 V along with a resistance of 2950 Ω in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be :
5050 Ω
5550 Ω
6050 Ω
4450 Ω
The magnetic induction at a point P which is at the distance of 4 cm from a long current carrying wire is 10-3 T. The field of induction at a distance 12 cm from the current will be :
3.33 × 10-4 T
1.11 × 10-4 T
3 × 10-3 T
9 × 10-3 T
