Permanent Magnets — Physics STD 11 Science — Question

The pattern of standing waves formed on a stretched string at two instants of time are shown in The velocity of two waves superimposing to form stationary waves is 360ms^–1 and their frequencies are 256Hz

1. Calculate the time at which the second curve is plotted.
2. Mark nodes and antinodes on the curve.
3. Calculate the distance between A′ and C′.

How does velocity of sound in air change when temperature rises by 1°C?

What would happen if the force of gravity were to disappear suddenly?

A particle is in linear simple harmonic motion between two points, A and B, 10cm apart. Take the direction from A to B as the positive direction and give the signs of velocity, acceleration and force on the particle when it is:
At the end B.

At what temperature do the Celsius and Fahrenheit scales coincide?

What is I second's pendulum? What is the length of a second's pendulum?

To measure the magnetic moment of a bar magnet, one may use:

1. A tangent galvanometer.
2. A deflection galvanometer if the earth's horizontal field is known.
3. An oscillation magnetometer if the earth's horizontal field is known.
4. Both deflection and oscillation magnetometer if the earth's horizontal field is not known.

Two sounds of very close frequencies, say 256Hz and 260Hz are produced simultaneously. What is the frequency of resultant sound and also write the number of beats heard in one second?

The breaking force for a wire is F. What will be the breaking force for

1. Two parallel wires of this size,
2. For a single wire of double thickness?