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Asked: January 23, 2025In: Class 12 Physics

In a simple microscope a convex lens of focal length 5 cm is used. Calculate the magnifying power when the object is placed at the focus of the lens.

When object is placed at focus of microscope lens, its magnified image is formed at infinity and magnifying power m = D/f = 25cm/5cm = 5. Class 12 Physics NCERT Sample Paper Question Session 2024-2025.

Shyam01 Sundar

Asked: January 22, 2025In: Class 12 Physics

An object approaches a converging lens with a uniform speed of 5 m s⁻¹ and stops at the focus. How will the image move with respect to the lens? Specify its nature.

As object approaches a converging lens from infinity to its focus with a uniform speed, its image moves away from the lens. The image starts from focus and goes upto infinity. The image is real and inverted one. Class 12 ...

Shyam01 Sundar

Asked: January 22, 2025In: Class 12 Physics

A solenoid with an iron core and a bulb are connected to a d.c. source. How does the brightness of the bulb change, when the iron core is removed from the solenoid?

The brightness of the bulb does not change because there is no effect of inductance of the solenoid in a d.c. circuit. Class 12 Physics NCERT Sample Paper Question Session 2024-2025.

Shyam01 Sundar

Asked: January 22, 2025In: Class 12 Physics

An electron with charge e and mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time ‘t, the electron travels halfway round the circle. What is the amount of work done by the magnetic field?

Zero, because force and displacement are in mutually perpendicular directions. Class 12 Physics NCERT Sample Paper Question Session 2024-2025.

Shyam01 Sundar

Asked: January 22, 2025In: Class 12 Physics

Name the physical quantity having unit J T-¹.

Magnetic dipole moment. Class 12 Physics NCERT Sample Paper Question Session 2024-2025.

In a simple microscope a convex lens of focal length 5 cm is used. Calculate the magnifying power when the object is placed at the focus of the lens.

An object approaches a converging lens with a uniform speed of 5 m s⁻¹ and stops at the focus. How will the image move with respect to the lens? Specify its nature.

A solenoid with an iron core and a bulb are connected to a d.c. source. How does the brightness of the bulb change, when the iron core is removed from the solenoid?

An electron with charge e and mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time ‘t, the electron travels halfway round the circle. What is the amount of work done by the magnetic field?

Name the physical quantity having unit J T-¹.

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