Discussion Forum

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.

Shyam01 Sundar

Asked: January 22, 2025In: Class 12 Physics

In a p-n junction, under equilibrium, there is no net current. Why?

In a p-n junction, under equilibrium, the drift current and the diffusion current are equal in magnitude but mutually opposite in direction and thus balance each other. So net current is zero. Class 12 Physics NCERT Sample Paper Question Session ...

Shyam01 Sundar

Asked: January 22, 2025In: Class 12 Physics

Why do we prefer alloys for making standard resistors?

Generally alloys are preferred for making standard resistors on account of their high resistivity and extremely low value of temperature coefficient of resistivity. Class 12 Physics NCERT Sample Paper Question Session 2024-2025.

Shyam01 Sundar

Asked: January 22, 2025In: Class 12 Physics

A glass rod rubbed with silk acquires a charge + 1.6 x 10-¹² C. What is the charge on the silk?

1.6 x 10-¹² С. Class 12 Physics NCERT Sample Paper Question Session 2024-2025.

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.

In a p-n junction, under equilibrium, there is no net current. Why?

Why do we prefer alloys for making standard resistors?

A glass rod rubbed with silk acquires a charge + 1.6 x 10-¹² C. What is the charge on the silk?

Which is the best website providing NCERT Solutions?

NCERT Books

Where can I get NCERT books in PDF format?

NIOS

NCERT Solutions

Sign Up

Sign In

Forgot Password

Discussion Forum Latest Questions