Can the dip at a place be (a) zero (b) `90^@`?

The earth's magnetic field at a place with zero declination is 3xx 10^(-4) T. The angle of dip at that place is 30^@ . A conducting rod is kept is north south direction and is moved at a constant speed of 1 m/s towards east. The emf induced in the rod is ...... (The length of the rod is 10 cm.)

A compass needle free to turn in a horizontal plane is placed at the centre of circular coil of 30 turns and radius 12 cm. The coil is in a vertical plane making an angle of 45° with the magnetic meridian. When the current in the coil is 0.35 A, the needle points west to east. (a) Determine the horizontal component of the earth's magnetic field at the location. (b) The current in the coil is reversed, and the coil is rotated about its vertical axis by an angle of 90° in the anticlockwise sense looking from above. Predict the direction of the needle. Take the magnetic declination at the places to be zero.

The magnetic dip angle at two places are 30° and 45°. Calculate ratio of horizontal components of earth's magnetic field at the two places. Magnetic field at the places is equal to .......

On the pan of a spring balance , is placed a beaker containing water . How will the reading of spring balance change if we dip our finger in this water ?

State whether each of the following statements is true or false : For an AP, the first term can never be zero.

At a place horizontal component of earth's magnetic field is sqrt(3) times its vertical component. The magnetic dip angle at the place is ...... radian.

A magnet makes an angle of 45° with the horizontal in a plane making an angle of 30^@ with the magnetic meridian. The true value of the dip angle at the place is .....

Can the average speed of an object in motion be zero ?

If tan A =cot B where A and B are acute angles prove that A+B= 90 ^(@)