Magnetic Effect of Electric Current Quiz 3 – Punjab Meritorious School Preparation Portal

Welcome to your 31st Aug Magnetic Effect of Electric Current Quiz 3 CBT TEST

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A current of 10 A is flowing through a circular coil of diameter 1 cm. What is the magnetic induction at its centre ?

The ratio of magnetic inductions at the centre of a circular coil of radius a and on its axis at a distance equal to its radius, will be -

The average radius of a toroid made out of a nonmagnetic material is 0.1m and it has 500 turns. If it carries 0.5 ampere current, then the intensity of magnetic field along its circular axis in Tesla will be

To obtain maximum intensity of magnetic field at a point the angle between position vector of point and small elements of length of the conductor is -

The value of intensity of magnetic field at a point due to a current carrying conductor is obtained from-

Gauss’s law

Faraday’s law

Coulomb’s law

Biot Savart’s law

When the number of turns in a toroidal coil is doubled, the value of magnetic flux density will become-

four times

eight times

half

double

The number of turns per unit length of a solenoid is 10. If its average radius is 5 cm and it carries a current of 10A, then the ratio of flux densities obtained at the centre and at the end on the axis will be -

1 : 2

2 : 1

1 : 1

1 : 4

A hollow tube is carrying an electric current along the length distributed uniformly over its surface. The magnetic field -

increases linearly from the axis to the surface

is non-zero inside the tube

inside the tube is zero

is zero just outside the tube

The vector form of Biot-Savart law is –

M At the centre of a straight solenoid the magnetic induction is B. If the length is reduced to half but to keep the number of turns same, these are wound in two layers, then the magnetic induction at the centre will be -

B/2

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