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- 1. Multiple Choice
An Electric charge in a uniform motion produces
An Electric Field only
An Magnetic field only
Both Electric Field & Magnetic field
Neither of them
- 2. Multiple Choice
Two parallel wires carry current in the same direction attract each other because of
Potential difference between them
Mutual inductance between them
Electric forces between them
Magnetic forces between them
- 3. Multiple Choice
The strength of the magnetic field around a straight conductor carrying an electric current
is same every where around the conductor
obeys inverse square law
is directly proportional to the square root of the distance
None of the above
- 4. Multiple Choice
A wire is parallel to the lines of the force of the magnetic field and the current flows in the wire. Then
The wire will experience a force along the direction of the magnetic field
The wire will not experience any force
The wire will experience the torque
The wire will experience a perpendicular force
- 5. Multiple Choice
A length of the wire carries a steady current. It is bent first to form a circular plane coil of one turn .The same length is now bent more sharply to give a double loop of the smaller radius .The magnetic field at the center caused by the same current is
A quarter of its first value
Un altered
Four times its first value
A half of its first value
- 6. Multiple Choice
Through two parallel wires A & B , 10 and 2 ampere of the currents are passed respectively in opposite direction. If the wire A is infinitely long and the length of the wire B is 2m. the force on the conductor B which is situated at 10 cm distance from A will be
8×10-6 N
8×10-5 N
4×10-5 N
4×10-5 N
- 7. Multiple Choice
An electron having a charge e moves with a velocity v in the x -direction. An electric field acts on it in y- direction. The force on the electron acts in
Positive direction of the y - axis
Negative direction of the y - axis
Positive direction of the x – axis
Negative direction of the x - axis
- 8. Multiple Choice
The resulting magnetic field at the point O due to the current carrying wire shown in the figure
Points vertically upwards
Points vertically downwards
is zero
Can not be determined
- 9. Multiple Choice
A semicircular wire of radius r , carrying a current I, is placed in a magnetic field of the magnitude B .The force acting on it
can never be zero
can have the maximum magnitude 2BIr
can have the maximum magnitude BIπr
can have the maximum magnitude Bir
- 10. Multiple Choice
A experimenter investigates the variation of the force F between the long , parallel current carrying conductors a distance d apart .A straight –line graph should be obtained on plotting
F against d
F against
F against
log |F| against d
- 11. Multiple Choice
A horizontal overhead power line carries a current of 90A in the east to west direction .What is the magnitude and the direction of the magnetic field due to the current 1.5 m below the line ?
0.6 ×10-5 T towards north
0.6 ×10-5 T towards south
1.2 ×10-5 T towards north
1.2 ×10-5 T towards south
- 12. Multiple Choice
A straight wire carrying a current of 10A is bent into a semi circular arc of the radius π cm as shown in the fig. What is the magnitude and the direction of the magnetic field at the centre O of the arc ?
10-4 T normal to the plane of the arc and directed in to the page
10-4 T normal to the plane of the arc and directed out side the page
2×10-4 T parallel to the plane of the arc and directed towards the left
2×10-4T parallel to the plane of the arc and directed towards the right
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