A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to the one of the sides of the loop and is in the plane of the loop. If a steady current I is established in wire as shown in figure, the loop will ____.
Rotate about an axis parallel to the wire
Move away from the wire or towards right
Move towards the wire
Remain stationary
If two streams of protons move parallel to each other in the same direction, then they ____.
Do not exert any force on each other
Repel each other
Attract each other
Get rotated to be perpendicular to each other
/
Zero
A moving coil sensitive galvanometer gives at once much more deflection. To control its speed of deflection ____.
A high resistance is to be connected across its terminals
A magnet should be placed near the coil
A small copper wire should be connected across its terminals
The body of galvanometer should be earthed
/
NAIB
2NAIB
Two long straight parallel conductors separated by a distance of 0.5m carry currents of 5A and 8A in the same direction. The force per unit length experienced by each other is ____.
There long straight wires A, B and C are carrying current as shown figure. Then the resultant force on B is directed ____.
Towards A
Towards C
Perpendicular to the plane of paper and outward
Perpendicular to the plane of paper and inward
Two long conductors, separated by a distance d carry current I1 and I2 in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its directions are reversed. The distance is also increased to 3d. The new value of the force between them is ____.
– 2F
F/3
2F/3
– F/3
A one metre long wire is lying at right angles to the magnetic field. A force of 1 kg wt. is acting on it in a magnetic field of 0.98 Tesla. The current flowing in it ____.
100 A
10 A
1 A
Zero
Two parallel wires of length 9 m each are separated by a distance 0.15 m. If they carry equal currents in the same direction and exerts a total force of 30 ( 10–7 N on each other, then the value of current must be ____.
2.5 amp
3.5 amp
1.5 amp
0.5 amp