# MAGNETIC EFFECTS OF CURRENT (TEST- 5)

A proton is moving along Z-axis in a magnetic field. The magnetic field is along X-axis. The proton will experience a force along ____.
X-axis
Y-axis
Z-axis
Negative Z-axis
An electron is moving with a speed of  perpendicular to a uniform magnetic field of intensity B. Suddenly intensity of the magnetic field is reduced to B/2. The radius of the path becomes from the original value of r ____.
No change
Reduces to r / 2
Increases to 2r
Stops moving
A uniform magnetic field acts at right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius 2 cm. If the speed of the electrons is doubled, then the radius of the circular path is ____.
2.0 cm
0.5 cm
4.0 cm
1.0 cm
If a proton is projected in a direction perpendicular to a uniform magnetic field with velocity v and an electron is projected along the lines of force, what will happen to proton and electron ____.
The electron will travel along a circle with constant speed and the proton will move along a straight line
Proton will move in a circle with constant speed and there is no effect on the motion of electron
There will not be any effect on the motion of electron and proton
The electron and proton both will follow the path of a parabola
A magnetic field ____.
Always exerts a force on a charged particle
Never exerts a force on a charged particle
Exerts a force, if the charged particle is moving across the magnetic field lines
Exerts a force, if the charged particle is moving along the magnetic field lines
A proton enters a magnetic field of flux density  with a velocity of  at an angle of  with the field. The force on the proton is ____.
Which of the following statement is true?
The presence of a large magnetic flux through a coil maintains a current in the coil if the circuit is continuous
A coil of a metal wire kept stationary in a non-uniform magnetic field has an e.m.f. induced in it
There is no change in the energy of a charged particle moving in a magnetic field although a magnetic force is acting on it
A proton (or charged particle) moving with velocity v is acted upon by electric field E and magnetic field B. The proton will move undeflected if ____.
E is perpendicular to B
E is parallel to v and perpendicular to B
E, B and v are mutually perpendicular and
E and B both are parallel to v
A proton and an electron both moving with the same velocity v enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that ____.
Their time periods is same
The time period for proton is higher
The time period for electron is higher
Their orbital radii is same
A charge + Q are moving upwards vertically. It enters a magnetic field directed to the north. The force on the charge is towards ____.
North
South
East
West
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MAGNETIC EFFECTS OF CURRENT

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