Magnetic Effect of Electric Current Quiz 5 – Punjab Meritorious School Preparation Portal

Welcome to your 9th Sep Magnetic Effect of Electric Current Quiz 5 CBT TEST

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A battery is connected between two points A and B on the circumference of a uniform conducting ring of radius r. One of the arc AB of the ring subtends an angle  at the centre. The value of the magnetic field at the centre due to the current in the ring is-

In a coaxial straight cable, the inner conductor and the outer conductor have equal currents in opposite directions. The magnetic induction is zero -

inside the inner conductor

inside the outer conductor

in between the two conductors

outside the outer conductor

A solenoid of 1.5 metre length and 4.0 cm diameter possesses 10 turns per cm. A current of 5 ampere is flowng through it. The magnetic induction at axis inside the solenoid is -

An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force on the electron is zero ?

Positive z-axis

Negative z-axis

Positive y-axis

Negative y-axis

Which statement is not correct -

Magnetic field at axis of current carrying wire is zero

Moving charge produce electric field and magnetic field

Magnetic field is measured by flux meter

Unit of electric field is gauss

The field normal to the plane of a wire of n turns and radius r which carries a current I is measured of the coil at a small distance h from the centre of the coil. This is smaller than the field at the centre by the fraction -

$The field normal to the plane of a wire of n turns and radius r which carries a current I is measured of the coil at a small distance h from the centre of the coil. This is smaller than the field at the centre by the fraction -$

A square conducting loop of side length L carries a current I. The magnetic field at the centre of the loop is-

independent of L

proportional to L2

inversely proportional to L

linearly proportional to L

An electron is accelerated from rest through a potential difference V. This electron experiences a force F in a uniform magnetic field. On increasing the potential difference to V', the force experienced by the electron in the same magnetic field becomes 2F. Then, the ratio (V'/V) is equal to

4/1

2/1

1/2

1/4

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