MAGNETISM: Ampere Circuital Law Quiz

The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into voltmeter that can read upto 50 V. The resistance to be connected in the series with the galvanometer is

Charged particle ‘q’ moving through a magnetic field with velocity V will have zero magnetic force when the angle is

Two parallel long wires carry currents i1 and i2 with i1 ＞i2. When the current is in the same direction, the magnetic field at a point midway between the wire is 20μT If the direction of i1 is reversed the field becomes 30μT. The ratio of i1/i2 is

A coil of diameter 0.2 cm is formed by a 6.28 m long wire and a current of 1 amp is passed in it. The magnetic induction at its centre will be ______ * 10^-5 T?

The magnetic field due to a current carrying circular loop of radius 4 cm at a point on the axis at a distance of 7 cm from the center is 48 μT. What will be the value at the center of the loop in micro T?

Which one of the following graphs depict the magnetic field B at a distance r from a long straight wire carrying current varies with distance r?
a)

b)

c)

d)

What is the magnetic field inside a pipe?

A long straight wire of radius x carries a steady current I. The current is uniformly distributed across its cross section. Calculate the ratio of the magnetic field at 𝑥4 and 8x.

A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 weber/m². The magnetic dipole moment of the coil is

A long straight wire of radius a carries a steady current I. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B’, at radial distances a/2 and 2a respectively from the axis of the wire is: