CBSE 12th Physics (Term 1) Paper 2021-22 | Magnetic Effect of Current Question 7 | Physics

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

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The magnetic field at the centre of a current carrying circular loop of radius R is B₁. The magnetic field at a point on its axis at a distance R from the centre of the loop is B₂. Then the ratio (B₁ / B₂) is

$$2\sqrt 2 $$

$${1 \over {\sqrt 2 }}$$

$$\sqrt 2 $$

$$2$$

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

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A current carrying wire kept in a uniform magnetic field, will experience a maximum force when it is

perpendicular to the magnetic field

parallel to the magnetic field

at an angle of 45$$^\circ$$ to the magnetic field

at an angle of 60$$^\circ$$ to the magnetic field

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

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A straight conducting rod of length l and mass m is suspended in a horizontal plane by a pair of flexible strings in a magnetic field of magnitude B. To remove the tension in the supporting strings, the magnitude of the current in the wire is

$${{mgB} \over l}$$

$${{mgl} \over B}$$

$${{mg} \over {lB}}$$

$${{lB} \over {mg}}$$

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

A constant current is flowing through a solenoid. An iron rod is inserted in the solenoid along its axis. Which of the following quantities will not increase?

The magnetic field at the centre

The magnetic flux linked with the solenoid

The rate of heating

The self-inductance of the solenoid

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Class 12 Subjects

Physics

Electromagnetism

Electrostatics Current Electricity Capacitor Magnetic Effect of Current Magnetic Properties of Matter Electromagnetic Induction Alternating Current Electromagnetic Waves

Optics

Geometrical Optics Wave Optics

Modern Physics