Question # 1

Torque on a current carrying coil

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τ=IBA cos

τ = ILB sinα

τ = IBA sinα

τ = ILBcosα

Energy stored per uint volume inside a solenoid is called as

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energy density

Electric flux

Work

Volume charge density

Weber is the unit of

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Magnetic flux

Permeability

magnetic force

None of above

Brightness of screen of CRO controlled by

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Grid

Filament

Anode

Cathode

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

A current carrying conductor experience maximum magnetic force in a uniform magnetic field when it is placed.

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Perpendicular to field

Parallel to field

At an angle of 60 ^o to the field

None of these

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 sensitivity of Galvanometer can be increased by:

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Increasing C/BAN factor

Decreasing C/BAN factor

Increasing angle θ

All of above

The Weber is unit of measure of:

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Conductance

Electric current

Magnitic flux

Electric flux

An ammeter is an electrical instrument which is used to measure.

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Voltage

Current

Resistance

None

Which one of the following resistance is used to convert a Galvanometer into an ammeter.

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High resistance

Low resistance in series with galvanometer

Shunt

High resistance in series with galvanometer

A sensitive galvanometer is

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Unstable

Stable

Moderate

Both B and C

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

When a charge is projected perpendicular to a uniform magnetic field, tis path is

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Spiral

Helix

Ellipse

Circular

If an electron is prijected in a magnetic field with velocity V, it will experience a force

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NIBA =

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cθ

θ/c

c²θ

c²/θ

In CRO, the output waveform of time base generator is

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Circular

Square

Sinusoidal

Saw-toothed

The magnetic field inside solenoid is given:

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μ_∘nI²

μ_∘nI

μ_∘n/1²

μ_∘I/n

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