Question # 1

Torque is produced in a current carrying coil when it is placed in a

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Magnetic field

Electric field

Gravitational field

Nuclear field

The magnetic flux will be max, For an angle of:

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0°

60°

90°

180°

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

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Ampere's law is applicable to:

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Circular path

Rectangular path

To any closed path

Nonwe of these

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

To convert a galvanometer into a volt meter a high resistance is connected.

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In series

In parallel

In perpendicular

Along tangent

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

Torque on a current carrying coil

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τ=IBA cos

τ = ILB sinα

τ = IBA sinα

τ = ILBcosα

The SI unit of magnetic induction Tesla is equal to

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N-1 Am

NA m2

NA-1n2

NA-1m-1

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

The Grid 'G' in cathode ray oscilloscope.

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Accelerate as well as focus electron beam

Control no. of electrons beam

Is at - Ve potential with respect to cathode.

Both d and b

If the length and number of turns of a solenoid are doubled strength of magnetic field with.

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Be doubled

Become half

Not change

Be four time

The dimensions of magnetic flux are

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M¹L^-2T¹A¹

MLT^-2A^-1

ML²T²A^-1

ML²T^-2A^-1

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

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Volt meter

Ammeter

Ohmmeter

Digital Multimeter

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

A voltmeter is always connected in

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Parallel

Series

Perpendicular

Straight line

A sensitive galvanometer is

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Unstable

Stable

Moderate

Both B and C

The vector sum of electric force and magnetic force is called:

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Deflecting force

Lorentz force

Newton force

Faraday's force

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