Question # 1

Lorentz force means the force acting on a particle, which is

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Magnetic force only

Electric force only

Sum of electric and magnetic force

None of these

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

One weber is equal to:

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N.A ²/m

N.m²/A

N.A/m

N.m/A

An electron moves at 2 x 10² m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force:

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1 x 10^-6 N

6.4 x 10^-17 N

3.6 x 10^-24 N

4 x 10⁶ N

For a current carrying solenoid the term 'n' has unit as.

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No unit

m^-1

m^-2

m-3

An electron enters the magnetic field at right angle from left, B is into paper. The electron will be deflected.

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upward

To ward right

Down ward

Toward left

Useful device to measure resistance, current and voltage is an electronic instrument called.

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Volt meter

Ammeter

Ohmmeter

Digital Multimeter

The acceleration of an electron of mass m and charge e, moving with uniform speed v at right angles to a magnetic field of flux density B, is given by

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Bevm

μ_∘(Ampere's constant) has value.

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4πx10^-7 WbA^-1m^-1

4πx10^-17 Wbm²

4πx10⁷ WbA^-1m^-1

4πx10-27 Wb/m²

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

The permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA

If current flowing through a solenoid becomes four times, then magnetic field inside becomes.

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two times

three times

four times

Half

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

For accurate measurement of current through a circuit, the resistance of ammeter should be

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Very small

Very high

Neither small nor high

None of the above

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

A Current flowing towards the reader is denoted by.

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Cross

a bracket

A dot

Positive sign

A charged particle having charge 'q' is moving at right angle to magnetic field. The quantity which varies is.

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Speed

Kinetic energy

Path of motion

angular velocity

Which one has the least resistance.

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Galvanometer

Ammeter

Ohm meter

Volta meter

A charged particle enters in a strong magnetic field its K.E.

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Remain constant

Increases

Decreases

Increases then decreases

1 tesla =

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1 MAm^-1

1NA^-1m

1NA^-1m^-1

None of above

The name of the scientist who noted that a compass needle was deflected when placed near the current carrying conductor

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Henry

Faraday

Coloumb

Oersted

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