NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
Moving Charges & Magnetism
153334
A magnetic field exerts no force on
1 a magnet
2 an unmagnetised iron bar
3 a moving charge
4 stationary charge
Explanation:
D Moving charge can develop magnetic field also experience the magnetic field. But stationary charge do not have the ability to develop or experience magnetic field. Because moving charge gives rise to current which is responsible for the magnetic effect.
JIPMER-2012
Moving Charges & Magnetism
153335
A proton moving vertically downward enters a magnetic field pointing towards north. In which direction proton will deflect?
1 East
2 West
3 North
4 South
Explanation:
A Proton will represent the direction of current. So, the direction of current is vertically downward. According to Fleming left hand rule, if middle finger represent the direction of current and fore-finger represent the direction of magnetic field then thumb will represent the direction of Lorentz force acting on the proton which deflect the proton in east direction.
JIPMER-2011
Moving Charges & Magnetism
153362
For protecting a sensitive equipment from the external magnetic field, it should be
1 placed inside an aluminium can
2 placed inside an iron can
3 wrapped with insulation around it when passing current through it
4 surrounded with fine copper sheet
Explanation:
B Iron is a ferromagnetic substance so there are no magnetic lines of force inside it. So to protect the sensitive equipment from external magnetic field it should be placed inside an Iron can.
MP PMT-2009
Moving Charges & Magnetism
153372
The direction of magnetic field at a point due to an infinitely long wire carrying current is :
1 parallel to the current
2 antiparallel to the current
3 along the perpendicular drawn from a point on the wire
4 perpendicular to the plane containing the conductor and the point
Explanation:
D According to right hand thumb rule the direction of magnetic field at a point due to an infinitely long wire carrying current both are perpendicular to each other. Hence, direction of magnetic field and an infinitely long wire carrying current is perpendicular to the plane containing the conductor and the point.
D Moving charge can develop magnetic field also experience the magnetic field. But stationary charge do not have the ability to develop or experience magnetic field. Because moving charge gives rise to current which is responsible for the magnetic effect.
JIPMER-2012
Moving Charges & Magnetism
153335
A proton moving vertically downward enters a magnetic field pointing towards north. In which direction proton will deflect?
1 East
2 West
3 North
4 South
Explanation:
A Proton will represent the direction of current. So, the direction of current is vertically downward. According to Fleming left hand rule, if middle finger represent the direction of current and fore-finger represent the direction of magnetic field then thumb will represent the direction of Lorentz force acting on the proton which deflect the proton in east direction.
JIPMER-2011
Moving Charges & Magnetism
153362
For protecting a sensitive equipment from the external magnetic field, it should be
1 placed inside an aluminium can
2 placed inside an iron can
3 wrapped with insulation around it when passing current through it
4 surrounded with fine copper sheet
Explanation:
B Iron is a ferromagnetic substance so there are no magnetic lines of force inside it. So to protect the sensitive equipment from external magnetic field it should be placed inside an Iron can.
MP PMT-2009
Moving Charges & Magnetism
153372
The direction of magnetic field at a point due to an infinitely long wire carrying current is :
1 parallel to the current
2 antiparallel to the current
3 along the perpendicular drawn from a point on the wire
4 perpendicular to the plane containing the conductor and the point
Explanation:
D According to right hand thumb rule the direction of magnetic field at a point due to an infinitely long wire carrying current both are perpendicular to each other. Hence, direction of magnetic field and an infinitely long wire carrying current is perpendicular to the plane containing the conductor and the point.
D Moving charge can develop magnetic field also experience the magnetic field. But stationary charge do not have the ability to develop or experience magnetic field. Because moving charge gives rise to current which is responsible for the magnetic effect.
JIPMER-2012
Moving Charges & Magnetism
153335
A proton moving vertically downward enters a magnetic field pointing towards north. In which direction proton will deflect?
1 East
2 West
3 North
4 South
Explanation:
A Proton will represent the direction of current. So, the direction of current is vertically downward. According to Fleming left hand rule, if middle finger represent the direction of current and fore-finger represent the direction of magnetic field then thumb will represent the direction of Lorentz force acting on the proton which deflect the proton in east direction.
JIPMER-2011
Moving Charges & Magnetism
153362
For protecting a sensitive equipment from the external magnetic field, it should be
1 placed inside an aluminium can
2 placed inside an iron can
3 wrapped with insulation around it when passing current through it
4 surrounded with fine copper sheet
Explanation:
B Iron is a ferromagnetic substance so there are no magnetic lines of force inside it. So to protect the sensitive equipment from external magnetic field it should be placed inside an Iron can.
MP PMT-2009
Moving Charges & Magnetism
153372
The direction of magnetic field at a point due to an infinitely long wire carrying current is :
1 parallel to the current
2 antiparallel to the current
3 along the perpendicular drawn from a point on the wire
4 perpendicular to the plane containing the conductor and the point
Explanation:
D According to right hand thumb rule the direction of magnetic field at a point due to an infinitely long wire carrying current both are perpendicular to each other. Hence, direction of magnetic field and an infinitely long wire carrying current is perpendicular to the plane containing the conductor and the point.
D Moving charge can develop magnetic field also experience the magnetic field. But stationary charge do not have the ability to develop or experience magnetic field. Because moving charge gives rise to current which is responsible for the magnetic effect.
JIPMER-2012
Moving Charges & Magnetism
153335
A proton moving vertically downward enters a magnetic field pointing towards north. In which direction proton will deflect?
1 East
2 West
3 North
4 South
Explanation:
A Proton will represent the direction of current. So, the direction of current is vertically downward. According to Fleming left hand rule, if middle finger represent the direction of current and fore-finger represent the direction of magnetic field then thumb will represent the direction of Lorentz force acting on the proton which deflect the proton in east direction.
JIPMER-2011
Moving Charges & Magnetism
153362
For protecting a sensitive equipment from the external magnetic field, it should be
1 placed inside an aluminium can
2 placed inside an iron can
3 wrapped with insulation around it when passing current through it
4 surrounded with fine copper sheet
Explanation:
B Iron is a ferromagnetic substance so there are no magnetic lines of force inside it. So to protect the sensitive equipment from external magnetic field it should be placed inside an Iron can.
MP PMT-2009
Moving Charges & Magnetism
153372
The direction of magnetic field at a point due to an infinitely long wire carrying current is :
1 parallel to the current
2 antiparallel to the current
3 along the perpendicular drawn from a point on the wire
4 perpendicular to the plane containing the conductor and the point
Explanation:
D According to right hand thumb rule the direction of magnetic field at a point due to an infinitely long wire carrying current both are perpendicular to each other. Hence, direction of magnetic field and an infinitely long wire carrying current is perpendicular to the plane containing the conductor and the point.
