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- 1. Multiple Choice
A circular coil of radius 10 cm is placed in X - Y plane, a constant current of 10 A is flowing in it in clockwise sense. The magnitude and direction of magnetic field at the centre are
2 10^-5 T along z - axis
2 10^-5 T along z axis
2 10^-5 T along z - axis
2 10^-5 T along z axis
- 2. Multiple Choice
A constant current I is flowing in a long solid cylindrical rod of radius R. The ratio of magnetic fields at the perpendicular distances R/2 and 3R/2 from the axis of the wire:
3:1
1:3
3:4
4:3
- 3. Multiple Choice
A constant current 10 A is flowing in a long conducting wire, the magnitude of the magnetic field due to the wire at a distance 100 m along the axis of the wire is
0
4 10^-8 T
2 10^-8 T
2 10^-8 T
- 4. Multiple Choice
A wire is kept along north - south direction and a constant current is flowing in it in north to south direction. What will be the direction of the force on the wire if it is placed in constant magnetic field along west to east direction:
Downwards
Upwards
Along left side
Along right side
- 5. Fill in the Blank
Out of miliammeter and an ammeter the -------- is of lesser resistance.
- 6. Fill in the Blank
The resistance of an ideal voltmeter should be ----
- 7. Multiple Choice
The direction of torque on the coil is along ------ axis.
X - axis
Negative X - axis
Y - axis
Negative Y - axis
- 8. Multiple Choice
The material used in making of the suspension wire used in moving coil galvanometer should be of -------torsional constant and ------- elastic constant.
high, low
high, high
low, low
low, high
- 9. Multiple Choice
A charge particle is moving undeflected in a uniform electric and magnetic fields, now the magnetic field is switched off, the trajectory of the particle will be
circular
helical
straight line
elliptical
- 10. Multiple Choice
The frequency of a charge particle revolving in a perpendicular uniform magnetic field is directly proportional to its velocity as
- 11. Multiple Choice
The magnetic field at centre o will be
- 12. Fill in the Blank
Torque on a current carrying rectangular coil inside a galvanometer is maximum and constant irrespective of its orientation as it is suspended inside _________ magnetic field.
- 13. Multiple Choice
The ratio of voltage sensitivity ( ) and current sensitivity ( ) of a moving coil galvanometer is (G =conductance)
- 14. Multiple Choice
A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
B
2B
4B
8B
- 15. Multiple Choice
The sensitivity of a moving coil galvanometer can be increased by decreasing
the number of turns in the coil
the area of the coil
the magnetic field
the restoring torque per unit twist of the suspension
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