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An electron (mass = 9( 10–31kg. Charge = 1.6 ( 10–19C) whose kinetic energy is 7.2 ( 10–18 joule is moving in a circular orbit in a magnetic field of 9 ( 10–5 weber/m2. The radius of the orbit is ____.

1.25 cm

2.5 cm

12.5 cm

25.0 cm

A charged particle is released from rest in a region of steady uniform electric and magnetic fields which are parallel to each other the particle will move in a ____.

Straight line

Circle

Helix

Cycloid

Two ions having masses in the ratio 1 : 1 and charges 1 : 2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2 : 3. The ratio of the radii of circular paths along which the two particles move is ____.

4 : 3

2 : 3

3 : 1

1 : 4

An electron and a proton have equal kinetic energies. They enter in a magnetic field perpendicularly, Then ____.

Both will follow a circular path with same radius

Both will follow a helical path

Both will follow a parabolic path

All the statements are false

The cyclotron frequency of an electron grating in a magnetic field of 1 T is approximately ____.

28 MHz

280 MHz

2.8 GHz

28 GHz

An electron moving with a uniform velocity along the positive x-direction enters a magnetic field directed along the positive y-direction. The force on the electron is directed along ____.

Positive y-direction

Negative y-direction

Positive z-direction

Negative z-direction

An electron is projected along the axis of a circular conductor carrying some current. Electron will experience force ____.

Along the axis

Perpendicular to the axis

At an angle of 4o with axis

No force experienced

A very high magnetic field is applied to a stationary charge. Then the charge experiences ____.

A force in the direction of magnetic field

A force perpendicular to the magnetic field

A force in an arbitrary direction

No force

A electron (q = 1.6 ( 10–19 C) is moving at right angle to the uniform magnetic field 3.534 ( 10–5 T. The time taken by the electron to complete a circular orbit is ____.

2 (s

4 (s

3 (s

1 (s

In case Hall effect for a strip having charge Q and area of cross-section A, the Lorentz force is ____.

Directly proportional to Q

Inversely proportional to Q

Inversely proportional to A

Directly proportional to A

1.25 cm

2.5 cm

12.5 cm

25.0 cm

A charged particle is released from rest in a region of steady uniform electric and magnetic fields which are parallel to each other the particle will move in a ____.

Straight line

Circle

Helix

Cycloid

Two ions having masses in the ratio 1 : 1 and charges 1 : 2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2 : 3. The ratio of the radii of circular paths along which the two particles move is ____.

4 : 3

2 : 3

3 : 1

1 : 4

An electron and a proton have equal kinetic energies. They enter in a magnetic field perpendicularly, Then ____.

Both will follow a circular path with same radius

Both will follow a helical path

Both will follow a parabolic path

All the statements are false

The cyclotron frequency of an electron grating in a magnetic field of 1 T is approximately ____.

28 MHz

280 MHz

2.8 GHz

28 GHz

An electron moving with a uniform velocity along the positive x-direction enters a magnetic field directed along the positive y-direction. The force on the electron is directed along ____.

Positive y-direction

Negative y-direction

Positive z-direction

Negative z-direction

An electron is projected along the axis of a circular conductor carrying some current. Electron will experience force ____.

Along the axis

Perpendicular to the axis

At an angle of 4o with axis

No force experienced

A very high magnetic field is applied to a stationary charge. Then the charge experiences ____.

A force in the direction of magnetic field

A force perpendicular to the magnetic field

A force in an arbitrary direction

No force

A electron (q = 1.6 ( 10–19 C) is moving at right angle to the uniform magnetic field 3.534 ( 10–5 T. The time taken by the electron to complete a circular orbit is ____.

2 (s

4 (s

3 (s

1 (s

In case Hall effect for a strip having charge Q and area of cross-section A, the Lorentz force is ____.

Directly proportional to Q

Inversely proportional to Q

Inversely proportional to A

Directly proportional to A

MAGNETIC EFFECTS OF CURRENT

IIT JEE Physics: Magnetism AIEEE Physics: Magnetostatics AIPMT Physis:magnetic effects of current MEDICAL ENTRANCE: magnetic effecs of current

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