Kalmasi

Ashok0210

Asked: February 23, 2021In: Class 12 Physics

A straight horizontal conducting rod of length 0.45 m and mass 60 g is suspended by two vertical wires at its ends. A current of 5.0 A is set up in the rod through the wires. (a) What magnetic field should be set up normal to the conductor in order that the tension in the wires is zero? (b) What will be the total tension in the wires if the direction of current is reversed keeping the magnetic field same as before? (Ignore the mass of the wires.) g = 9.8 m s⁻².

Class 12 Physics CBSE and UP Board Moving Charges and Magnetism Chapter-4 Exercise 4.21 Additional Exercise

Ashok0210

Asked: February 23, 2021In: Class 12 Physics

A magnetic field set up using Helmholtz coils (described in Exercise 4.16) is uniform in a small region and has a magnitude of 0.75 T. In the same region, a uniform electrostatic field is maintained in a direction normal to the common axis of the coils. A narrow beam of (single species) charged particles all accelerated through 15 kV enters this region in a direction perpendicular to both the axis of the coils and the electrostatic field. If the beam remains undeflected when the electrostatic field is 9.0 × 10⁻⁵ V m⁻¹, make a simple guess as to what the beam contains. Why is the answer not unique?

Class 12 Physics CBSE and UP Board Moving Charges and Magnetism Chapter-4 Exercise 4.20 Additional Exercise

Ashok0210

Asked: February 23, 2021In: Class 12 Physics

An electron emitted by a heated cathode and accelerated through a potential difference of 2.0 kV, enters a region with uniform magnetic field of 0.15 T. Determine the trajectory of the electron if the field (a) is transverse to its initial velocity, (b) makes an angle of 30º with the initial velocity.

Class 12 Physics CBSE and UP Board Moving Charges and Magnetism Chapter-4 Exercise 4.19 Additional Exercise

Ashok0210

Asked: February 23, 2021In: Class 12 Physics

Answer the following questions: (a) A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path with constant speed. What can you say about the initial velocity of the particle? (b) A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal the initial speed if it suffered no collisions with the environment? (c) An electron travelling west to east enters a chamber having a uniform electrostatic field in north to south direction. Specify the direction in which a uniform magnetic field should be set up to prevent the electron from deflecting from its straight line path.

Class 12 Physics CBSE and UP Board Moving Charges and Magnetism Chapter-4 Exercise 4.18 Additional Exercise

Ashok0210

Asked: February 23, 2021In: Class 12 Physics

A toroid has a core (non-ferromagnetic) of inner radius 25 cm and outer radius 26 cm, around which 3500 turns of a wire are wound. If the current in the wire is 11 A, what is the magnetic field (a) outside the toroid, (b) inside the core of the toroid, and (c) in the empty space surrounded by the toroid.

Class 12 Physics CBSE and UP Board Moving Charges and Magnetism Chapter-4 Exercise 4.17 Additional Exercise

Aadeep

Asked: February 23, 2021In: Class 12 Biology

Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?

NCERT Solutions for Class 12 Biology Chapter 1 Reproduction in Organisms Important Board Questions Reproduction in Organisms NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 18

Aadeep

Asked: February 23, 2021In: Class 12 Biology

Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers. Do you know any other plant that bears unisexual flowers?

NCERT Solutions for Class 12 Biology Chapter 1 Reproduction in Organisms Important Board Questions Reproduction in Organisms NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 17

Aadeep

Asked: February 23, 2021In: Class 12 Biology

What is a bisexual flower? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.

NCERT Solutions for Class 12 Biology Chapter 1 Reproduction in Organisms Important Board Questions Reproduction in Organisms NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 16

Aadeep

Asked: February 23, 2021In: Class 12 Biology

Describe the post-fertilization changes in a flower.

NCERT Solutions for Class 12 Biology Chapter 1 Reproduction in Organisms Important Board Questions Reproduction in Organisms NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 15

Aadeep

Asked: February 23, 2021In: Class 12 Biology

Differentiate between gametogenesis from embryogenesis.

NCERT Solutions for Class 12 Biology Chapter 1 Reproduction in Organisms Important Board Questions Reproduction in Organisms NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 14

Kalmasi

Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?

Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers. Do you know any other plant that bears unisexual flowers?

What is a bisexual flower? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.

Describe the post-fertilization changes in a flower.

Differentiate between gametogenesis from embryogenesis.

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